Q. Which of the following is / are examples of extrusive rocks?

1. Basalt
2. Andesite
3. Granite

Select the correct option from the codes given below:
Answer: Only 1 and 3
Notes: When the molten magma cools, it becomes solid. Rocks thus formed are called igneous rocks. They are also called primary rocks. There are two types of igneous rocks: intrusive rocks and extrusive rocks. Lava is actually fiery red molten magma coming out from the interior of the earth on its surface. When this molten lava comes on the earth's surface, it rapidly cools down and becomes solid. Rocks formed in such a way on the crust are called extrusive igneous rocks. They have a very fine grained structure. For example, basalt. The Deccan plateau is made up of basalt rocks. Basalt and Andesite are examples of extrusive rocks. Granite is example of intrusive rock.