In the initial chapters the authors describe the physico chemical nature of the deep sea floor and the methods used to collect and study its.
Floor of the deep sea.
Deep sea trenches and their approaches are striking features on the ocean floor.
The deep sea is a relatively mysterious and unknown part of the earth as only about 1 of the ocean floor has been explored by humans.
Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.
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Deep sea exploration has revealed varied landscapes which include volcanoes seamounts hydrothermal vents and cold seeps.
In order to take full advantage of these opportunities for discovery scientists and explorers must first overcome one of the biggest challenges of deep ocean exploration.
Narrow flat abyssal.
Many deep sea creatures cope by creating light themselves also known as bioluminescence.
Deep sea divers face a number of threats like the adverse physiological effects of high water pressure threats from strange and dangerous sea creatures failure of diving equipments etc.
The deep sea or deep layer is the lowest layer in the ocean existing below the thermocline and above the seabed at a depth of 1000 fathoms 1800 m or more.
Deep sea biology provides a comprehensive account of the natural history of the organisms associated with the deep sea floor and examines their relationship with this remote and inhospitable environment.
In fact there have been more missions into space than journeys down to the greatest depths of the oceans.
Coelacanths were thought to be extinct until found alive in 1938.
Temperatures at the ocean floor also vary greatly.
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Continental shelf 300 feet continental slope 300 10 000 feet abyssal plain 10 000 feet abyssal hill 3 000 feet up from the abyssal plain seamount 6 000 feet.
The ocean floor in particular is home to unique marine organisms as well as enormous geological features like volcanoes canyons and ridgelines.
This graphic shows several ocean floor features on a scale from 0 35 000 feet below sea level.
The following features are shown at example depths to scale though each feature has a considerable range at which it may occur.
The japanese spider crab is the largest known crab with a maximum leg span of 3 8m.
Little or no light penetrates this part of the ocean and most of the organisms that live there rely for subsistence on falling organic matter produced in the photic zone for this reason scientists once assumed that life would be sparse.
Typical slopes range between 4 and 16 although slopes as steep as 45 have been measured in the tonga trench of the equatorial south pacific.
Narwhals dive to this depth up to 15 times a day in search for food.
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Collard iii author gregory wenzel illustrator 5 0 out of 5 stars 5 ratings.
