Which one of the following is not a characteristic of continental shel

Which one of the following is not a characteristic of continental shelves ?

Sites of productive fishing grounds
Oil and gas reserves
Sites of submarine canyons
Large stores of sand and gravel
This question was previously asked in
UPSC CISF-AC-EXE – 2017
While submarine canyons can cut across continental shelves, they are more characteristic features of continental slopes, not the shelf itself as a defining characteristic.
Continental shelves are gently sloping underwater extensions of continents, known for shallow depths and abundant marine life.
Continental shelves are important for fishing grounds due to their biological productivity and are significant sources of oil and gas reserves. They also accumulate large amounts of sediment, forming stores of sand and gravel. Submarine canyons are steep-sided valleys cut into the seabed.
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