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

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Choose the correct statement

1.

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

2.

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

The Hawaiian ridge is the largest unbroken oceanic ridge.
The Mid-Atlantic Ridge is the largest unbroken oceanic ridge.

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