Question

Q. Consider the following statements regarding causes of volcanic activities:

Which of the above statements is/are correct?

• A.
  1 only
• B.
  1 and 2 only
• C.
  2 and 3 only
• D.
  1, 2 and 3

Answer 1

The correct option is D

1, 2 and 3
Explanation:

Statement 1 is correct: Volcanoes are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth's crust.

Statement 2 is correct: A build up of pressure in the earth is released by things such as a plate movement which forces molten rock to explode into the air causing a volcanic eruption. The lava from the eruption then cools to form a new crust. Over time, generally several eruptions, the rock builds up and forms a volcano.

Statement 3 is correct: Faulting, folding, thrusting are also responsible for causing the magma to come to the surface.