All those materials which form the crust of the earth whether hard like granite or soft clay, gravel or sand stone are called rock. Three types of rocks Igneous, Metamorphic and Sedimentary. Igneous rock formed due to cooling, solidification and crystallization of molten earth materials known as magma or lava. Igneous rock also known as primary or parent rock. Two type of igneous rock Intrusive and extrusive.
Rocks lecture by Dr. Abhishek Baldwa
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