Q3 of 26 Page 20

Identify and name the internal movement.

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

Volcanic eruptions cause molten magma to be thrown out of the earth’s crust.

Explanation - Volcanic eruptions occur when either plates sink below another plate (subduction), heating and creating magma, or plates pull apart, allowing magma to rise to the surface. In both these conditions, the magma reaches the surface or is thrown out to the surface through vents and fissures.


More from this chapter

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3

Identify and name the internal movement.

Tsunamis are generated in coastal areas.

 3

Identify and name the internal movement.

The Himalayas are an example of fold mountains.

 3

Identify and name the internal movement.

Rift valley is formed because of faulting.

 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.