1. Where does the sediment that makes up the continental rise come from? a. Cont
ID: 286930 • Letter: 1
Question
1. Where does the sediment that makes up the continental rise come from?
a. Continents via Rivers
b. From the ocean floor
c. Volcanoes
d. Hawaii
2.Which of the choices below is the term that is used to refer to a remarkably flat, deep and fine sediment-covered ocean floor that sits between the foot of a continental rise and a mid-ocean ridge?
a. Continental shelf
b. Guyot
c. Abyssal plain
d. Continental slope
3.When magma comes up to the surface along the mid-ocean ridges of the world, it displaces the newly created rock above it to either side of the ridge. As this process continues over time, what age pattern does the ocean floor eventually exhibit?
a. Rock will be older as you move away from the ridge
b. Rock will be younger as you move away from the ridge
c. The age of the rock will not change as you move away from the ridge
4.Scientists know that new lithosphere is constantly being created at the mid-ocean ridges. However, the Earth is not getting larger in size. This means that lithosphere is getting recycled elsewhere. Where does the majority of this older lithosphere end up? Choose the best answer below:
a. It is assimilated into the mantle
b. It is assimilated into the asthenosphere
c. It is disintegrated at the plate boundary before it subducts
d. The Earth actually is getting larger in size. Lithosphere is not being recycled
Explanation / Answer
1. Option "A" is correct, Continental rise is formed by deposition of sediments by turbidy currents, deposition and mass wasting processes.
2. Option "c" is correct, Abyssal plain usually found at depth from 3000 to 6000 meters, covering with sediments mostly of clay and mud. The abyssal floor is usually formed by oceanic crust melting and seafloor spreading.
3. Option "A" ,at the oceanic ridges new flow of magma occurs forming new ocean floor following old oceanic floor to push away and assimilate at the subduction zone. So, as you go away from MOR, you will find older oceanic crust.
4. Option "A" , recycling of crust occurs where the lithospheric material is assimilated into the mantle by erosional and subduction processes, recycling the material into the mantle.
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