Q. Consider the following statements regarding causes of volcanic activities:
Which of the above statements is/are correct?
Explanation:
Volcanoes are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth's crust. 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.