Discussion

Match the following :

Ocean bottom configuration	Characteristics
(a) continental shelf	(1) Covers two-third part of the ocean floor.
(b) continental slope	(2) Depths between 3000 and 5000 fathoms
(c) ocean deeps	(3) Off broad low land coasts
(d) deep sea plains	(4) Abrupt change of gradient

Answer: C

The correct matching is a-3, b-4, c-2, d-1.

Continental shelf: widest off broad lowland coasts, where the land's gentle slope continues under the sea.
Continental slope: marked by an abrupt change of gradient at the edge of the shelf.
Ocean deeps: the trenches, the deepest parts of the ocean, the paper giving 3,000 to 5,000 fathoms.
Deep sea plains: the abyssal plains, covering about two-thirds of the ocean floor.

The other options give the abrupt gradient change, or the two-thirds coverage, to the wrong feature.

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