Ocean Trenches Flashcards Preview

GCSE Geography AQA A Restless Earth > Ocean Trenches > Flashcards

Flashcards in Ocean Trenches Deck (4)
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1
Q

What are Ocean Trenches?

A

They are the deepest parts of the ocean floor.
Ocean Trenches are hemispheric-scale long but narrow topographic depressions of the sea floor.
Oceanic trenches are a distinctive morphological feature of convergent plate boundaries, along which lithospheric plates move towards each other at rates that vary from a few mm to over ten cm per year.

2
Q

Where are Ocean Trenches located?

A

They are embedded into the Earth’s mantle, so the magma keeps on going a round in a loop

3
Q

Where is the deepest part of the ocean?

A

Mariana trench.

4
Q

Where are Ocean Trenches formed?

A

Formed at subduction zones, where it is denser and where the continental crust goes under the oceanic crust.