Question

4. 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.

a) What type of rocks is formed in such a way on the earth crust?

b) Mention some of the characteristics of such kind of rocks.

c) Give some examples of such kind of rocks. Mention a region in India where

we get such kind of rocks.​

Answer 1

Explanation:

1. Rocks formed in such a way on the crust are called extrusive igneous rocks. They have a very fine grained structure. For example, basalt.

2.Rocks are classified according to characteristics such as mineral and chemical composition, permeability, texture of the constituent particles, and particle size. These physical properties are the result of the processes that formed the rocks.

3.5 Rocks found in India: Rocks found in India are classified into three broad categories, viz. igneous, sedimentary and metamorphic rocks. Their occurrences vary from widespread stretches to small patches or pockets throughout the country. The distribution of various rocks are to be studied in geography.

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