Discussion
Assertion (A) : Large avalanches usually occur on slopes of 30°-50°.
Reason (R) : The optimum condition for geomorphologically significant avalanche, snow accumulation are on slope of 30°-50°.
Answer: A
Both (A) and (R) are correct and (R) is the correct explanation of (A).
Large avalanches most often start on slopes of roughly 30° to 50°. On gentler slopes the snow does not slide readily, and on steeper slopes it cannot build up, because it sloughs off in small amounts as it falls.
That is what (R) states: the 30° to 50° range is where enough snow can accumulate and still become unstable. Because snow accumulation on such slopes is the condition for a large avalanche, (R) explains (A).
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