Discussion
Which of the following are block mountains ?
Answer: D
The block mountains are the Vosges.
Block mountains form when large sections of the earth's crust are broken by faults and displaced vertically: the uplifted blocks are horsts and the sunken ones graben. NCERT's Class 7 geography gives the Vosges in France and the Black Forest in Germany as examples, standing on either side of the Rhine rift valley.
The Himalayas and the Ural are fold mountains, formed by the folding of rock layers under compression; the Himalayas are young fold mountains and the Ural very old ones. The Appalachians in North America are also old fold mountains, worn down by erosion.
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