◾The earth is made up of rocks and soil.
◾The rocks are made up of small grains which are of naturally occurring substances known as minerals.

KINDS OF ROCKS:

1. Igneous Rocks
◾The word Igneous means fiery (consisting of fire).
◾These rocks are formed by the cooling of molten rocks.

Q. Define magma. 
Ans - The hot liquid-rock, that lies below the earth's crust is called magma.

Q. Define lava. 
Ans - The magma that reaches the earth's crust and flows out is called lava. 

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