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Q70
(CISF/2017)
Geography › World Physical Geography
Which one of the following is not a characteristic of continental shelves?
Result
Your answer:
—
·
Correct:
C
Explanation
Continental shelves are the shallow, submerged extensions of continents, typically reaching depths of up to 200 meters. They are characterized by several key features:
- Productive Fishing Grounds: Due to shallow waters, sunlight reaches the bottom (photic zone), promoting plankton growth, which supports massive fish populations (e.g., Grand Banks).
- Resources: They contain thick sedimentary deposits that are primary sources of oil and natural gas, as well as sand and gravel used in construction.
- Submarine Canyons: These are deep, V-shaped valleys that are primarily characteristics of the continental slope and continental rise. While some canyons may notch the outer edge of the shelf, they are geologically defined as features of the steeper slope where turbidity currents are most active.
Therefore, submarine canyons are not a primary characteristic of the continental shelf itself.
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