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Mice21 [21]
3 years ago
6

Describe how ocean basin shrinking takes place at convergent boundaries. Give an

Geography
1 answer:
Harlamova29_29 [7]3 years ago
5 0

When two tectonic plates collide/converge, usually a continental and an oceanic plate, the oceanic plate is submerged by the tectonic one because it is denser. The plate dives into the mantle and is consumed. The boundary, therefore, keeps ‘eating’ up the oceanic  plate hence reduces it over time. An example is the Mariana Trench (a subduction zone) in the Pacific ocean. The Pacific ocean, therefore, continues to shrink over time.

On the other hand, divergent boundaries (such as the one in the Atlantic Ocean) make new crust.

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The correct answer is - Layer 2 and layer 9 are the same relative age.

On this image we can see multiple layers that have been cut through and displaced by a fault. The layer 2 and the layer 9 despite not being at the same level, with level 2 being closer to the surface, while layer 9 deeper into the ground, we can still see signs that they actually have the same relative age.

We can notice that these two layers have the same relative age because of two things. The first thing is the index fossils, with both of these layers having the same fossils from the same geologic period. The second thing that gives us a clue is their composition which is pretty much identical, thus indicating of a same geological period.

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Answer:

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Number one - A

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