Q3 of 26 Page 20

Identify and name the internal movement.

Rift valley is formed because of faulting.

Tension within the earth’s crust which leads to faulting creates rift valleys.

Explanation - When the energy waves within the earth’s mantle move away from each other, they create tension on the layers of rock surrounding the waves leading to fractures in the earth’s crust. Sometimes, two fractures can occur parallel to each other and the crust between these fractures subside forming the rift valley.


More from this chapter

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3

Identify and name the internal movement.

The Himalayas are an example of fold mountains.

 3

Identify and name the internal movement.

Molten magma is thrown out of the earth’s mantle.

 4

Arrange the following statements in chronological order in which an earthquake occurs.

A. The earth’s surface vibrates


B. The plates suddenly move.


C. Due to the movements in the mantle, compression goes on increasing.


D. Along the weak points (fault lines) rocks break apart.


E. Stored energy is released in the form of seismic waves.

 5

Distinguish between -

Block Mountain and Fold Mountain