What do you mean by primary rocks? Write their features.

1.	What do you mean by primary rocks? Write their features.
Answer» Igneous rocks are formed by the solidification of lava. Lava cools rapidly and solidifies on the surface of earth. Crystals are formed due to the cooling of lava. These rocks are intrusive as well as extrusive. It is believed that the earth was in a molten state in the beginning. Igneous rocks were the first rocks to be formed due to cooling and solidification of molten matter. Hence, these are called Primary rocks. The importance of Igneous rocks Igneous rocks supply different types of minerals. Granite is used for house-building and idol-making. Basalt is used for road-making. Monuments are made from these hard rocks.

Answer»

Igneous rocks are formed by the solidification of lava. Lava cools rapidly and solidifies on the surface of earth. Crystals are formed due to the cooling of lava. These rocks are intrusive as well as extrusive. It is believed that the earth was in a molten state in the beginning. Igneous rocks were the first rocks to be formed due to cooling and solidification of molten matter. Hence, these are called Primary rocks.

The importance of Igneous rocks
Igneous rocks supply different types of minerals. Granite is used for house-building and idol-making. Basalt is used for road-making. Monuments are made from these hard rocks.

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