Ridges and deeps — task. Social Science, Class 9.

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Choose the correct statement

1.

Trenches occupies about 7% of the total relief of the ocean floor.
Trenches occupies about 25% of the total relief of the ocean floor.

2.

Trenches are rich in organic sediments, and most trenches are V-shaped.
Trenches are sediment-free, and most trenches are V-shaped.

3.

Dragon Hole is the deepest known underwater sinkhole in the world.
Blue lake is the deepest known underwater sinkhole in the world.

4.

Mid-ocean ridges are made of young basaltic rock formed in the convergent boundary where two tectonic plates move close to each other.
Mid-ocean ridges are made of young basaltic rock formed in the divergent boundary where two tectonic plates move apart.

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