What is the continental shelf quizlet?
Continental shelf. a gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent. Continental slope. the steep gradient that leads to the deep-ocean floor and marks the seaward edge of the continental shelf. Submarine canyons.
What is the largest continental shelf?
The world’s largest continental shelf extends 1,500 km (about 930 miles) from the coast of Siberia into the Arctic Ocean. Continental shelves are usually covered with a layer of sand, silts, and silty muds.
What are the qualities of the continental shelf?
Most continental shelves are broad, gently sloping plains covered by relatively shallow water. Water depth over the continental shelves averages about 60 meters (200 feet). Sunlight penetrates the shallow waters, and many kinds of organisms flourish—from microscopic shrimp to giant seaweed called kelp.
What is insular shelf?
The zone surrounding an island extending from the line of permanent immersion to about 100 fathoms (600 ft or 183 m) of depth, where a marked or rather steep descent toward the great depths occurs.
Why is the continental shelf good for fishing?
Continental shelves and seamounts host – in addition to petroleum and mineral reserves – by far the largest share of the world’s most productive fishing grounds. They provide shelter, feeding, spawning and nursery grounds for thousands of species, including commercial fish.
What is the average depth of continental slope?
The continental slopes extend gradually from the continental shelf break to the continental rise (c. 3000 m depth), with an average gradient of around 4°.
What is called continental slope in one sentence?
Continental slope – The slope is “the deepening sea floor out from the shelf edge to the upper limit of the continental rise, or the point where there is a general decrease in steepness” (IHO, 2008). On average, the slope is a narrow band ~41 km wide that encircles all continents and islands.
What does continental slope mean?
: the comparatively steep slope from a continental shelf to the ocean floor.
Why do passive margins have continental slope?
Passive continental margins are found along the remaining coastlines. Because there is no collision or subduction taking place, tectonic activity is minimal and the earth’s weathering and erosional processes are winning.
How long is the continental rise?
This area can be as narrow as 15 miles and as wide as 228 miles. After the continental shelf, you would be in for a bit of a fall.
What is the difference between an active continental margin and a passive continental margin?
An active continental margin is found on the leading edge of the continent where it is crashing into an oceanic plate. Passive continental margins are found along the remaining coastlines.
How deep is the abyssal zone?
The Abyssopelagic Zone (or abyssal zone) extends from 13,100 feet (4,000 meters) to 19,700 feet (6,000 meters). It is the pitch-black bottom layer of the ocean.