Introduction to Deep Sea Environment

The deep-water environment in this essay we will examine various aspects of deep-sea environment. The main focus will be on the environment below the mesopelagic zone that extends up to 2000 meters below sea level, with an emphasis on the environment in the And bathypelagic zones Abyssalpelagic.

Let's examine the sources of evidence for discussion of this deep-water environment by watching some of which man uses techniques to collect information there. This is followed by a description of some of the factors determining conditions in these regions with a note on the geology, sediments, a brief analysis of deep water bodies, a description of marine life found in the deep sea environment, their adaptations and the challenges with a special note on hydrothermal vents (although at an average depth of 2100 meters that are only within our area of discussion), oil leaks and a final conclusion about the overall importance of deep-sea environment of mankind.

First, why study the environment of waters deep at all? The abyssal plains are dark and appear devoid of life or of interest but nothing could be further from the truth. Abyssal zones represent more than 90% of the benthos and over 80% of the oceans is below 3000 meters. New discoveries are being made and these could greatly influence our future.

The deep sea is a repository of scientific information and resources that can affect us in the fields of medicine, chemistry, physics, biology, feeding the growing world population and conservation. The ocean floor is actually the largest ecosystems on Earth. Consider first methods of gathering evidence. The collection of evidence there are many techniques and devices have been used to explore the depths and collect information ranging from the days of lead weights out line (sound) on the side of ships to echo sounder from the First World War to the invention of scuba gear (not useful in our depths under discussion), the use of long-range inclined Geological ASDIC (GLORIA). Side-scan sonar and survey methods continuous seismic give us a wealth of information.

Besides a wide range of simple devices give us information, such as thermometers, bottles water and flow meters to measure the physical and chemical properties of water, dredges, probes, heat sensors and cameras for the study of bottom sediments and the lower life. However, for centuries the only evidence we had of marine life in the depths of the sea was very low. The area we are discussing rarely is visited. Using atmospheric diving suits (JIM) can only cope with around 450 meters today. We need different equipment to explore the depths we are discussing. In 1964, Alvin made the first successful deep-water scientific diving manned submersibles on behalf of the Woods Hole Oceanographic Institute. Later, updated versions have been able to dive to 6,000 meters.

Alvin was first discovered hydrothermal vents and explore a small section of the oceanic ridge half. We come back to this later environment. For depths below this we rely on remotely operated vehicles or ROVs. Cutting-edge research is done by ROV by Woods Hole OI and the Monterey Bay Aquarium Research Institute .. He has even visited the lowest point. In January 1960 Piccard and Walsh, descended in the Trieste II (a bathyscaphe), the deepest known point on Earth, the Mariana Trench at 10,915 meters. Despite the overall paucity of evidence and the fact that the vast majority of the seabed that remains to be explored can discuss the deep-sea environment in a dynamic way.

New discoveries frequently been made in this field. Let us now see the geological basis of deep-sea environment. The geology of the oceanic lithosphere is about 100 km thick (thus significantly thinner than continental lithosphere) and this refers to the crust and upper mantle. The lithosphere is composed primarily of peridotite. The top of the lithosphere is the crust, which consists primarily of granitic rock, lighter. The oceanic crust is thinner and denser than the crust continental and consists mainly of basaltic rock. All lithosphere (oceanic and continental) sits on top of the viscous lower layer called the asthenosphere, which is part of the upper mantle.

The lithosphere is composed of 7 main courses and 6 smaller ones. New oceanic lithosphere, or at least the oceanic crust, forms on constructive plate boundaries. To the seafloor spreading ridge asthenosphere wells and cooled to form the ocean floor on both sides of the border. The Middle Atlantic Ridge is a classic example of this. The destruction of oceanic lithosphere in subduction zones. Subducting plate descends into the hot mantle and is destroyed when it melts. The coast of Japan, offers an example. It should be noted that the environment is dynamic in geological time, as the process Subduction destroys the ocean floor. As the sea floor is formed again pushes the soil away to both sides and it can reach into a subduction zone and be destroyed. It is possible that until the date of the oceanic crust as the plates separate and spread over the abyssal plain, and to assume the polarity of Earth's magnetic field. The work has been described by Matthews and Vine.

Also generally speaking the age of the oceanic crust of the far-spreading ridges is. The material also denser sinks further from the sea surface. Given the age / depth relationship with age of oceanic crust can also be estimated. The key features of "geographic feature" of the ocean basins are perhaps one with a mid ocean ridge abyssal plain of each side of this range of plate margins constructive or destructive plate margins with a deep-water ditch at the edge of deep water environment with sediment pelagic covers the ground. Naturally there are many variations to this pattern but that leads to a consideration of sedimentation.

The sediments in the deep-sea environment in the true deep-water environment are in fact only refers to deep-sea sediments. However, there are two main types of sediments, terragenous less pervasive and bioclastic and the types of volcanic sediments and hydrothermal vent activity. Sediment can also be classified as species pelagic or deep-sea sediments. If you look at first terragenous sediments, these are the result of the erosion of continental rocks. The eroded material is deposited on the continental shelf by runoff or other physical actions and progress of the continental shelf seaward sediment deposition. Submarine Fans can be for example, the giant fan flows Ganges and eventually move out of the sediments of the continental shelf and the abyssal plain. Therefore, this brief analysis of sediments terragenous is useful as they do eventually enter our competition discussion. The ocean moves the thicker material on the pattern turbidity and occasionally there are sudden movements, such as 1929 Grand Banks turbidity event in North America. Bioclastic sediments are the result of the activity biological and include the remains of dead plants and animals pelagic have sunk. Bioclastic sediments are also called pelagic oozes and can be composed by calcareous materials or silaceous.

Calcareous ooze is composed of chalk remains of foraminifera and pteropods, and forms the deep ocean clay red. Silaceous material derived from deposits of radiolarians and diatoms and are found mainly in tropical and polar seas. The distribution of production reflects the mud primary taking place near the surface. The thickness of the sediments also reflects the age of oceanic crust to the thickness increases as one moves from mid-ocean ridges for example. Volcanic ash from eruptions also can travel long distances and end up being deposited in the ocean, thus contributing to the sediments. By Finally, around hydrothermal events have only metalliferous sediments with mud. It is also noted that the sediments in the abyssal plains are not completely static, such as currents, earthquakes and tectonic activity can move them. The understanding of sediment in the deep sea environment is crucial when we talk about life in this region. Deep Water Conditions deepwater is insulated from the effects of wind below the Ekman spiral, which only affect up to 100 meters.

However, surface changes can result in deep-water circulation with changes in temperature, density and salinity. Cold sinks and dense water moves very slowly along the deep ocean, which require hundreds of years to move across an ocean basin. No changes daily or seasonal effectively and this creates a very stable environment.

Below 3,000 meters of the area is effectively isothermal except for areas around hydrothermal vents. The regions discussed in this essay is mainly Abyssalpelagic Bathypelagic and water areas are dark asique, limited food, the cold and great pressure. For every 10 million increase in depth the pressure increases by an atmosphere of what we are discussing the pressures of 200 to 600 atmospheres of or more in our region since the average depth of the deep sea is 4,000 m and in some cases going at 11,000 meters from the trenches. A review of conditions deep water will be vital to sustain life in our section of deep water living environment in the Deep Sea environment despite the apparent difficulties and the challenges of life in the environment of deep-sea organisms have managed to exploit these regions.

Let's take a look at some of the major groups of inhabitants, some of the difficulties they face and, finally, some of the adaptations that have evolved to cope with life in the deep sea. First we analyze briefly the presence of microorganisms in the deep sea. In fact, most organisms in the deep sea are microorganisms. These microbes are able to tolerate High pressure (barotolerant) and others actually depend on high pressure (barophilic). In the Mariana Trench is barophiles extreme.

The majority of these Microbes are also psychrophilic that is as cold conditions. The bacteria in these levels have been adapted enzymes and membranes. However, much remains done in this field and the results can sometimes be inconclusive or at least very surprising. For example, in 1996 the Japanese submersible Kaiko picked the mud of the Challenger Deep in the Mariana Trench, and when the thousands of bodies were examined, none of them barophilic, halophilic or acidophilic but surprisingly alkaliphiles thermophiles and even so we must be careful in making the generalization of the hadal zone. However, other samples taken at the same time resulted in barophiles successful isolation of certain matters relating to gender Shewanella, Colwellia and Moritella.

However, as we shall see not only live microbes in these areas. The animals in the environment at sea The deep sea is home to most of the phyla of animals, but changes in the abundance of different animals, more depth. Research in the Kuril-Kamchatka shows that sponges are dominant up to 2000 meters, but we are focused on the deeper regions. Sea cucumbers are the most common animals found below 4000 meters and polychete worms are a large percentage of animals that inhabit benthic or bottom. Sea cucumbers and seapigs (Holothuroidea) are often the most common animal in deep dredges. Seapigs have been captured at 10,000 feet deep in the Kermadec tench. They feed by plow deep-sea mud and digest bacteria and organic matter. Some can swim above the mud though. Starfish have found up to 7,000 meters. Brittle and basket stars (Ophiuroidea) are. The small crustaceans such as amphipods and isopods, and mollusks (like clams) and anemones sea have been found at great depths. There were relatively few crabs and fish at these depths, but this may have been more to do with the sampling methods used.

In the ocean deposit feeders predominate sea cucumbers and worms in deeper levels. In fact, There are many species of smaller animals infaunal here. Some estimates about a million different species of benthic invertebrates in sediments deep water. This demonstrates why our previous examination of the sediment is so fundamental to a discussion of the deep ocean. However, the number of individual animals decreases from the surface to the depth hadal trenches. We have said that there are relatively few crabs and fish that are deep but are represented.

We can take as examples three species. First, a fish that is often ignored by his rivals the most spectacular – Fish or fish Rattail Grenadiers. This is called benthopelagic or background as they swim just above the bottom. This relationship of cod is, in fact, the most common fish found in the abyssal depths. The lives deeper Macrouridae observed up to 6500 meters. Macrouidae These belong to the family and have large heads and thin bodies and the food by hunting and scavenging. They are being fished commercially.

Secondly we have the fish Hatchet (Argyropelecus olfersi) are camouflaged with silver bodies, a flattened body of the silhouette and the reduction of photophores that match the sink light and are therefore difficult to see. They seek water top with tubular eyes. Let us consider these adjustments in the next section. Third is the lantern fish (Ceactoscopelus warmingii), which are about 5 to 15 centimeters long, with numerous photophores and migrate upward to feed daily. We have space here only to discuss some of the many species in the deep-sea environment. Other species are sea urchins, crinoids, tripod fish, gulper eels, sponges and seapens. Some are permanent residents in this environment, as deep sea cucumbers and others are visitors to our region, like the great shark in Greenland (Greenland shark) down to 2,200 meters and six gills Hexanchus up to 2,500 meters, but all have some adaptations to deal with deep-sea environment.

These and other adaptations to life in the water environment deep will now be discussed in more detail. Challenges deep sea animals and their adaptations Let's choose to discuss five main categories as follows: adaptations pressure, temperature, food availability, lack of light, and reproduction. Pressure and temperature of the animals adapt to the pressure in a variety of ways, including sperm whales have lungs that can shrink by 1% of its normal volume, monkfish have reduced the skeletons and other fish, reduced muscle mass. Cucumbers sea have the body composed mainly of water and other proteins and enzymes are adapted to work under pressure. Sharks have fat livers instead of the bladders swim to cope with the extremes of pressure. It is also difficult to produce calcium carbonate shells due to pressure and temperature issues. As the pressure increases and temperature decreases soluble calcium carbonate becomes making it difficult for the creatures that secrete shells. The depth when may not cause the calcium carbonate is called the carbonate compensation depth of the CCD.

Today, the Convention on the ranges of the Pacific, 4200 meters to 4,500 meters deep and the Atlantic, 5,000 meters deep. Many species have dispensed with the formation of Shell below the compensation depth carbonate. Thus, we see that there are chemical and physiological adaptations to cope with increased pressure. Secondly, there is a brief discussion of the temperature. The ocean floor is largely stable isothermal temperatures prevailing need some adjustments. Hydrothermal vents are an exception to this rule and we will discuss in more detail later in the thesis .. Food availability in terms of food availability concerns that many animals use adaptations to cope, from the behavior of predators and scavengers, opportunistic feeding on whale carcasses vertical migration strategies.

Let's look more detail now: Basically, food availability decreases with depth as well as species diversity. Food supply to the deepwater depends Primary production in the photic zone (except for areas of hydrothermal vents). However, it is estimated that only 2% of phytoplankton sink to Basically, since they are mainly consumed above or on the way down. Because food is relatively scarce marine organisms have a number of ways to do front.

Which can loosely categorize these as: 1) energy conservation adjustments, such as slow movements, their metabolism is slow, and some fish muscle with relatively low compared to fish in shallower seas. 2) Related to the conservation of energy that some fish are predators of eg stalking, catching deep-sea fish using bioluminescent lures. 3) Dwarfism and gigantism are the methods of dealing with food availability by example, a small nematode worms and amphipods extremely large (up to 28cm) in the other. 4) The physiological adaptations also include distended stomach and jaws articulated in some species to cope with the possibility of rare power e, g, anglerfish and gulper eels but even bivalves in the deep ocean was found to have more value to maximize the availability of food. 5) In connection with this food fit, but perhaps in a class of its own have animals adapted to feed on dead whales. These are very important and provide food supplies for many years to an area of ocean floor in a time. 43 species have been found in a whale carcass for example, sharks, lampreys, bone zombies eating worms, snails, barnacles, clams and anaerobic bacteria. Since there are many similarities to organisms found around these hydrothermal vent channels may have acted as a reinforcement for ventilating stones evacuation. 6) deposit feeders. Since the sea floor is dominated by biogenic slightly compacted mud which is dominated by deposit feeders as the deep sea cucumber (Scotoplanes). Deposit feeders may make up to 80% of the species in the deep sea. Most of the seabed is covered soft clay or mud and oozes fact skeletons of marine animals, small and fecal material. The mud in the gulf can reach several hundred meters thick. Some animals walking on the bottom have long legs to remove the mud to avoid such deep sea spider. These are not true spiders but belong to the pycnogonids. Other species which grow anchored to the bottom of the sea and has long stems to keep clear of power structures in mud. 7) vertical migration. Some fish move up to feed and swim bladders have replaced with fatty deposits in order to cope with the huge differences in pressure.

Rattail fish mentioned above is a good example of these trips up to 1,700 meters up in the night to feed. This is just a brief cross section of the ways in which the animals from limited food supplies. Lack of light may light creates some of the most interesting adaptations. The eyes of the fish in the deep sea tend to be generally larger than their counterparts above, but below 2000 meters eyes again grow smaller or absent. Eyes contain a highest density of rods in the retina of the eyes or tubular hatchet fish are common, for example. Where eyes are useless in total darkness have developed other methods to detect the environment. The well developed lateral lines to sense vibrations and antennas can also be used for example in the hairy anglerfish.

Bioluminescence is another adaptation with 60 to 70% of deep-sea animals that have this capability. Organs called photophores, sometimes using bacteria as a source light found in many fish such as lantern fish. Or simple photophores produce light or retain the light-producing bacteria such as Vibrio or Photobacterium in a relationship symbiotic. Since bacteria produce light continuously host animals develop ways to control such emissions, reflective layers, flaps and lenses. Squid has the most spectacular skills in this area. Bioluminescence can be used as a lure for food or for defense. Areas of photophores in the rape are lures. The hatchet fish using light to camouflage the squid and the defense as an unexpected burst of light can distract an attacker.

Since the sense dominant in the deep sea is we ought to discuss this issue a bit more detail. Many invertebrates detect the sound of the cilia. Fish detection by the sensory hairs otolith organ in the inner ear. The lateral line systems also allow the fish to detect sound vibrations, movements of the dam and the fish in schools and changes in ocean currents. Animals from around the hydrothermal vent systems can build on this to avoid openings themselves, but the discussion again later vent. When we consider the view that there are also a variety of systems in use. There are relatively simple systems, such as eyespots eg worms polychete the spherical lens systems that allow fish to have a perception of light beyond the capabilities of the man, as mentioned above.

Then one must consider the sense of orientation in marine animals. Several species can detect the force of gravity known as statocysts bodies. In vertebrates the semicircular canal in the ear performs this function. Then come to chemoreception covering the senses of taste and smell. The sense of smell (smell) is very well developed in the sharks. and venture into these areas we are discussing. Electroreception otherwise used by sharks and other predatory fish that have electrosensory organs. These sharks are known as ampullae of Lorenzini.

Finally, there sense of magnetoreception and magnetite crystals found in fish that allows them to walk long distances. Much remains to be done in this area it seems, especially in relation to deep sea species. Reproduction Finally, we have the adjustments in the reproduction in deep sea with the egg yolks with large to combat food shortages, long-lived species with slow sexual maturity can also help in this area. The relative difficulty to find the isolated pair may also have led to high rates of hermaphrodites behavior. For example tripod fish have both male and female sexual organs. The tripod is unusual in that male and female bodies can reach maturity, while allowing the fish to fertilize their own eggs. Perhaps it is so sparsely distributed as a fish can not find a mate at the right time. The adaptation of the famous male rape in the tiny parasites is another adaptation to this isolation. The small claws in the female and male even partially absorbed by ensuring a supply of fertilizer at the right time. Deep-sea species tend to be slow growing, late maturation and low reproductive capacity. Many species of deep-sea fish live 30 years or older and orange roughy, can live to 150 years. These are just some of the adaptations to the deep sea. If we look in more detail in certain communities only in the environment deep sea can be seen other adaptations A note on hydrothermal vents and hydrocarbon seepage hydrothermal vent systems are one such community. These have been really interesting discoveries from Alvin in 1977 in the Galapagos Rift zone.

Developing systems of hydrothermal vents depths of several kilometers in the oceans in the mid-ocean spreading centers where hot lava outcroppings. The sea water is filtered and passed again at a temperature hot, full of minerals, as well is filtered hot, white or black "smokers". White smokers are only slightly cooler than smokers black and because they are rich in zinc have a white tint. Animals here must have a unique set of adaptations. Because they are very far from the photic zone of the inhabitants depend Beggiatoa bacteria to produce food as Chemosynthetic caustic compounds such as hydrogen sulfide. These bacteria are sometimes mats near the vents and turn to grazing by limpets and gastropod molluscs. Other communities of bacteria live in symbiosis with the giant tube worms (Riftia pachyptila), for example. Riftia can grow up to 1.5. meters long and have special adaptations for deep-water environment that can carry oxygen and hydrogen sulfide in the blood to supply the bacteria. The clams (Calyptogena magnifica), close to the ventilation systems have similar techniques.

Until now, scientists have discovered more than 236 species of all ventilation systems. 223 of them were new to science and many of them endemic to ventilation systems. More systems ventilation have been explored, for example, hole to hell and hanging gardens on the East Pacific Rise, the nest of snakes in the dorsal mid-Atlantic and Rose Garden in the failure of the Galapagos Area. How these species evolved and spread from one system to another is a matter of interest and one theory suggests it may whale carcasses used as a springboard.

There are many theories about how life may have originated around these vents and in fact these areas have even been developed for the first time where photosynthesis as there is a slight haze around these vents. There are animal environments here with the extreme ultraviolet sensitivity, and large shrimp with a massive amount of eyes.The photoreceptors in their ventilation systems are very dynamic and unstable but admit only adapted communities of marine life that are a part of the debate, the deep-sea environment Besides that perhaps we should also consider another unique environment that is deep water, oil leaks. These come in our study because some of these cliffs over 2,000 meters deep.

Marine hydrocarbon seepage are cool (unlike the hydrothermal vents of the activity) and have two main sources, biogenic (production Bacterial gases) and petrogenic ie refers to the underground oil seeping to the surface. Some gases are filtered arise from dissociation CH4 hydrate, an ice water are stable at great depths and low temperatures. The oil filtering volcanism produces asphalt, salt water pools, gas hydrates and authigenic carbonates. Oil leaks are a feature in the Gulf of Mexico and we know from research conducted at the site of Chapopote what they are minerals. According to a study by the University of Texas, the communities of chemosynthetic fauna dependent on oil and gas leaks were found in over 45 sites in the Gulf of Mexico until now and the 2200 meters below sea level.

The dominant fauna consist of species within four groups: tube worms, mussels filter, epibenthic infaunal clams and mussels. The development of these communities is closely linked to geological and geochemical processes filtration. Temperatures ranged from 5 to 9 degrees Celsius. All consequences and the importance of both hydrothermal vents and hydrocarbon seepage may has not yet been sufficiently aware of or fully researched, but it is fascinating and vital elements of deep-sea environment. Conclusion We have addressed briefly the geology, sedimentation, water body and life forms and their adaptations in deep-sea environment. Until recently the importance of this environment to man was poorly studied and may not be considered particularly relevant to the future of man on Earth. In this summary, is to be played in seven key areas we have chosen to link the deepwater environment with the future of mankind.

The first issue relates to biodiversity. Of the 500,000 estimated 10 million of species living in the deep sea, most are yet undiscovered. There could be no clearer example of the value of deep-sea environments world. Approximately 98% of the world's species live on or above the seabed. (This includes some areas strictly outside our jurisdiction). Many of these species are associated with seamounts, for example. However, the unique environments host an extraordinary variety of species with high rates of endemism. Each unsampled trench, ventilation, filtering is a potential source of numerous undiscovered species. In addition to two-thirds of all known coral species live in waters that are deep, dark and cold, to more than 3000 meters deep, which belongs to our discussion area. Some of these cold-water corals are 5-8,000 years of age or older and over 35 meters high. These and other organisms that form the habitat provide protection from currents and predators, nurseries for young fish, and feeding, breeding and spawning areas for hundreds of thousands of species and therefore are a fundamental feature of biological diversity of land.

Secondly, we consider the worldwide supply increasingly larger population. Commercially important deep-sea fish and shellfish populations found at sea including crabs, shrimp, cod, Pacific cod, orange roughy, Pentacerotidae, grenadier, Patagonian toothfish (also known as Chilean sea bass), mackerel, snapper, snapper, sharks, grouper, rockfish, the black cod and Atka mackerel.

Thirdly, we have medical uses and implications of deep-sea environment. For example, gorgonian corals produce antibiotics. Agents cancer compounds found in certain deep-water sponges are immunouppressive powerful anti-Semitic. In addition, some corals contain the pain of compounds known as pseudopterosians death. Seafans contain high concentrations of posaglandins to treat asthma and heart disease.

Our fourth point concerns energy and mineral resources. The environment of deepwater ports unexplored deposits of oil, gas and minerals. Seismic surveys have been detected so far only a fraction of available reserves. A resource hungry world need to exploit these reserves at some point in their future and the more we know about the deep sea environment, the better we can use these reserves and expects to reduce the impact.

Fifth, we must consider the relationship of deep-sea environment to our immediate environment. At first there seems little direct connection between abyssal depths and our own world. However, a study from Indiana University in the deep sea hydrothermal vents may play a role important in regulating the temperature and chemical balance of the oceans. Before the discovery of hydrothermal vents, scientists believed that the balance ocean chemistry was determined mainly by runoff from the continents. Now, hydrothermal vents (and filtered oil) influence is considered important. In fact, the university described hydrothermal circulation systems with all the far-reaching effects. Effects of pollution and circulation systems deep waters are vital to understanding the Earth's environment.

Sixth, we must consider the importance of pure scientific deepwater. Discovery is an untapped treasure and resource. For example ancient deep-sea corals provide valuable records of climatic conditions that may help our understanding of global climate change. Studies of this environment are making contributions to nearly all branches of the science of climatology to search for the origins of life itself and in fact the sea is often seen as an extreme environment conditions comparable to those prevailing in other planets. Finally, we will always be aware of the commercial attractions of the deep. These commercial considerations ranging from the exploitation of hydrocarbon reserves, reserves minerals, deep sea fishing to deep-sea communities, particularly corals and sponges that are untapped source of natural products with enormous potential as pharmaceuticals (see above) enzymes, pesticides and cosmetics. For the collection of deep-sea environment in a responsible manner, we can help to a more balanced and prosperous world, but overexploitation may cause global chaos. Future for all these reasons, an understanding of deep-sea environment is fundamental to humanity.

Dr Simon Harding

www.biblon.com

Deep Sea Conservation Coalition Source

University Studies Indiana hydrothermal circulation studies at the University of Texas oil leaks

Monterey Bay Aquarium Research Institute

New Scientist

About the Author

A Rare Pelagic Octopus Encounter, Haliphron atlanticus

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2010 K2 Extreme (Flat) $327.99 The Extreme has the confidence and stability to rip any terrain and it has the torsional strength and durability to handle the toughest of landings and the most punishing abuse in the park. Emulate PK Hunder’s double cork 1080 or just bust out some of the ol’ moves on the topsheet. Either way we’ll be proud. Keep it Extreme.

2009 K2 Extreme (Flat) $269.99 Extreme-The legend is reborn as a highly versatile twin tip. In the late 80’s K2 released a ski called the Extreme an incredibly versatile high performance all-mountain performer with an innovative graphic and style. You asked for it back and we brought it back. Just like Its predecessor this ski has the torsional strength and durability to withstand the toughest of landings and the confidence and stability to rip any terrain but its twin tip enables you to ride and land switch with ease. The Extreme is absolutely the most functional in-bounds twin tip available today.

BATTERY BLOCK F/ PULSAR EXTREME AND OTHERS $30.1 BATTERY BLOCK F/ PULSAR EXTREME AND OTHERS

5.5 ft Electric Powered Extreme Air Hockey Table $199.99 5.5 ft Electric Powered Extreme Air Hockey Table

SanDisk Extreme SDCFX-032G-E61 CompactFlash-Karte (CF) 32 GB – 400x $150.32 SanDisk Extreme SDCFX-032G-E61 CompactFlash-Karte (CF) 32 GB – 400x

SanDisk Extreme Pro SDCFXP-064G-E91 CompactFlash-Karte (CF) 64 GB – 600x $504.8 SanDisk Extreme Pro SDCFXP-064G-E91 CompactFlash-Karte (CF) 64 GB – 600x

SanDisk Extreme Pro SDCFXP-032G-E91 CompactFlash-Karte (CF) 32 GB – 600x $262.89 SanDisk Extreme Pro SDCFXP-032G-E91 CompactFlash-Karte (CF) 32 GB – 600x

ASUS P3-P5G31 Barebone-System Intel G31 – Sockel T – Celeron, Core 2 Duo (Dual-Core), Core 2 Extreme (Dual-Core), Core 2 Extreme (Quad-core), Core 2 Quad, Penti $119.9 ASUS P3-P5G31 Barebone-System Intel G31 – Sockel T – Celeron, Core 2 Duo (Dual-Core), Core 2 Extreme (Dual-Core), Core 2 Extreme (Quad-core), Core 2 Quad, Penti

Adapteur WI-FI Apple Airport Extreme MB988ZM/A IEEE 802.11n (draft) 54 Mbps $50.33 Adapteur WI-FI Apple Airport Extreme MB988ZM/A IEEE 802.11n (draft) 54 Mbps

SanDisk Extreme IV SDCFX4-8192-902 CompactFlash-Karte (CF) 8 GB $80.97 SanDisk als Marktf hrer f r leistungsstarke Flash-Technologie pr sentiert die neusten Vorzeigeprodukte: Die Extreme IV-Reihe der CompactFlash-Karten. Die Extreme IV-Reihe der CompactFlash-Karten besteht aus unseren neuesten Digitalfilmkarten f r anspruchsvolle Profi-Fotografen, die beste Leistung und besonders gro e Kapazit ten f r ihre Mittelformat- und Digitalspiegelreflexkameras ben tigen.