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- In the ocean, tectonic processes continuously create and destroy oceanic crust. When tectonic plates collide, denser plates dive under less dense ones, creating trenches and mountains. New sea floor is constantly created as plates move apart, keeping Earth from shrinking.
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These sediments accumulate on the ocean floor within areas characterized by little planktonic production. The clays which comprise them are transported into the deep ocean in suspension, either in the air over the oceans or in surface waters.
People also ask
What is the floor of the Pacific Ocean like?
Why is seafloor spreading a theory of plate tectonics?
What is the difference between pelagic zone and oceanic zone?
How does seafloor spreading affect the age of oceanic crust?
When the concept of seafloor spreading came along, scientists recognized that it was the mechanism to explain how continents could move around Earth’s surface. Like the scientists before us, we will now merge the ideas of continental drift and seafloor spreading into the theory of plate tectonics.
As we discussed in Chapter 10, oceanic crust is formed at sea-floor spreading ridges from magma generated by decompression melting of hot upward-moving mantle rock (Figure 10.18). About 10% of the mantle rock melts under these conditions, producing mafic magma.
- Steven Earle
- 2015
The pelagic zone refers to the open, free waters away from the shore, where marine life can swim freely in any direction unhindered by topographical constraints. The oceanic zone is the deep open ocean beyond the continental shelf, which contrasts with the inshore waters near the coast, such as in estuaries or on the
The floor of the Pacific, like those of the other oceans, is actually very flat, even in areas with seamounts or deep trenches. The vast sediment-covered abyssal plains of the oceans are much flatter than any similar-sized areas on the continents.
- Steven Earle
- 2015
Jul 31, 2024 · Seafloor-spreading rates are much more rapid in the Pacific Ocean than in the Atlantic and Indian oceans. At spreading rates of about 15 cm (6 inches) per year, the entire crust beneath the Pacific Ocean (about 15,000 km [9,300 miles] wide) could be produced in 100 million years.
In the ocean, tectonic processes continuously create and destroy oceanic crust. When tectonic plates collide, denser plates dive under less dense ones, creating trenches and mountains. New sea floor is constantly created as plates move apart, keeping Earth from shrinking.
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- Khan Academy
%20material%20layer%20of%20the%20earth&ck=E6D4552AD4FDBD6C2C1DE1096B6F63F7&idpp=rc&idpview=singleimage&form=rc2idp "why is the pacific ocean floored with pelagic (oceanic) material layer of the earth1")
%20material%20layer%20of%20the%20earth&ck=2ED9621EA0DA9C97122FC244A0036C11&idpp=rc&idpview=singleimage&form=rc2idp "why is the pacific ocean floored with pelagic (oceanic) material layer of the earth2")
%20material%20layer%20of%20the%20earth&ck=E431A871EDDC7B4485CBEEDBB59AA76E&idpp=rc&idpview=singleimage&form=rc2idp "why is the pacific ocean floored with pelagic (oceanic) material layer of the earth3")
%20material%20layer%20of%20the%20earth&ck=A529FF7A14E0A4A835FDEA14C7AB2390&idpp=rc&idpview=singleimage&form=rc2idp "why is the pacific ocean floored with pelagic (oceanic) material layer of the earth4")
