Give reasons.
Some rocks have a shape of a mushroom.
[NCERT)
Flood plains are very fertile.
INCERT]
Wind is an active agent of erosion in deserts.
(d)
A delta is formed close to the sea.
e
Sea beaches are formed by sea.
Sea caves are turned into stacks.
[NCERT
(g)
Buildings collapse due to earthquakes.
[NCERT
Answers
Answer:
(1) this is because the bottom part of the rock gets flooded and the rock gets wider at the top and narrower at the bottom.
(2) Flood plains are formed by the deposition of fine soil and other material called sediments on the river banks. As the soil and sediments are brought by floodwater, they are very fertile.
(3) this is because winds carry sands and deposit it in flat areas and these are known as sand dunes.
(4) when the river approaches the sea, it gets slower and slower, and eventually, it breaks up into parts, and these parts deposit sand, silt, etc on the side. this is why deltas are formed near the sea.
(5) this is because the sea deposits a large amount of sand on the shore and therefore, it formes a beach.
(6) this is because seawater erodes these caves and formes sea arches. further erosion breaks these walls and therefore, stacks are created.
(7) buildings collapses depending upon the magnitude of the earthquaqe.