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Question
Consider the following statements and select the correct answer from the codes given below:
Assertion (A):
Japan is known for its fisheries in the world.
Reason (R):
The continental shelf is wide all around Japan.
Select the correct answer from the codes given below:
Options:
A .  Both A and R are true, but R is not the correct explanation of A.
B .  A is true, but R is false.
C .  Both A and R are true and R is the correct explanation of A.
D .  A is false, but R is true.
Answer: Option B
Answer: (b)
The continental shelf is narrow all around Japan. Around the Japanese Islands, the continental shelf is 20 to 30 km wide, narrower than its world average, with shelf-slope breaks of the average depth of 140 metres.
Narrow shelves are located offshore the western coast of the Oshima Peninsula, around Toyama Bay, and offshore from the Boso Peninsula to the Kii Peninsula. The selves in Toyama Bay, Sagami Bay, and Suruga Bay are extremely narrow, less than 1 km in width in closed-off sections of the bays.
Continental shelf slopes are not flat from shorelines through outer edges, but terrace-like topography (submarine terraces) and submarine valleys are found. Submarine valleys are often filled up with sediments derived from land.

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