geomorphology & earth landforms section 9 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Esker – A narrow, sinuous ridge of partly stratified coarse sand and gravel of glaciofluvial origin.

Answer: (c)

Anthracite is usually considered to be the highest grade of coal and is actually considered to be metamorphic.

Compared to other coals it is much harder, has a glassy lustre, and is denser and blacker with few impurities. It is largely used for heating domestically as it burns with little smoke.

Answer: (d)

Answer: (a)

New folded mountains are also caller Tertiary Mountains. All the old folded mountains were originated before the Tertiary period. The folded mountains of Caledonian and Hercynian mountain-building periods come under this category.

These mountains have been so greatly denuded that they have now become relict folded mountains, for example, Aravallis, Vindhyachal etc.

The Alpine folded mountains of the Tertiary period arc grouped under the category of new folded mountains, for example, Rockies, Andes, Alps, and Himalayas etc.

Answer: (c)

Answer: (c)

A geosyncline may be defined as “a thick, rapidly accumulating body of sediment formed within a long, narrow, subsiding belt of the sea which is usually parallel to a plate margin”. (Oxford Dictionary of Geography).

Or we may say a geosyncline is a “very large linear depression or down-warping of the earth’s crust, filled (especially in the central zone) with a deep layer of sediments derived from the landmasses on each side and deposited on the floor of the depression at approximately the same rate as it slowly, continuously subsided during a long period of geological time”.