Question

What is a rock? How are rocks classified on the basis of origin?

Answer 1

Instructions:

• Define rocks
• Types of rocks
• Process of formation

Solution:

• A rock is any natural mass of mineral matter that makes up the surface of the earth which we call the earth’s crust.
• Rocks can be classified into three types on the basis of origin:

1. Igneous rock

• Formed by the solidification of molten lava.

2.Sedimentary rock

• Formed by the deposition and solidification of sediments.

3.Metamorphic rock

• Formed due effects of high pressure and temperature on igneous or sedimentary rocks.