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A depression or hollow of considerable area extent surrounded on the side by two or more elevated tracts is called __________

(a) Valley

(b) Mountain

(c) Pit

(d) Crest

I got this question in my homework.

The origin of the question is Valleys topic in section Physiographic Features of Engineering Geology

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Correct answer is (a) Valley

For explanation I would say: A valley, in the geomorphic sense, is a depression or hollow of considerable area extent surrounded on side by two or more elevated tracts. Valleys may be the result of age-long erosion along the medial parts of elevated tracts, or, these might have been produced from a gradual or abrupt subsidence.

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