Q2 of 11 Page 26

How is the lithosphere formed?

● The Earth has evolved over a period of time. It was a big ball of fire with heavier substances at the bottom and the lighter ones at the top.


● When the earth cooled down, the heat could not be trapped due to lack of atmosphere.


● Since it was exposed, the surface cooled down quickly due to to the cold temperature of the space. This created a cool layer which sodified intro crust.


● This difference in magma created 2 different types of the lithosphere - Ocean and continental.


● The depth of the lithosphere varies from place to place. It is the deepest in the lower continents.


● The composition of each type of crust changes at the boundaries of the plate.


More from this chapter

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1

Find the odd out in the context of the lithosphere and give a reason for your choice Byson gorge; Grand Canyon; Ozone; Thar desert.

 3

How are the continental plates formed and how are they eventually destroyed?

 4

List out the landforms due to the river work.

 5

Draw a table as given below and fill information. And write a small paragraph to explain the similarities and difference that you can think of in the context of earth’s external changes. (if there is no information available in the text, leave the column blank)