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NCERT Class 7 Geography: Chapter 3, Question Give reasons Q.4
(i) Some rocks have a shape of a mushroom.
(ii) Flood plains are very fertile.
(iii) Sea caves are turned into stacks.
(iv) Buildings collapse due to earthquakes.
(i) In desert, wind is an active agent for erosion which erode the lower section of the rock more than the upper part. Therefore, some rocks have a shape of a mushroom having narrower base and wider top.
(ii) Flood plains are very fertile because floods deposit layers of fine soil and other material called sediments which is ideal for cultivation along its banks.
(iii) When cavities in sea caves become bigger and bigger only the roof of the caves remain forming sea arches. Further, erosion breaks the roof and only walls are left which forms the stacks.
(iv) During earthquakes, vibrations travel outwards from the epicentre as waves and propagate through the surface of the earth which produce sudden movements that leads to the collapse of buildings.
https://www.indcareer.com/schools/ncert-solutions-for-7th-class-geography-chapter-3-our-changing-earth/