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The earth surrounded by 70% of water and 30% of land and the land is divided into 3 layers earth crust , core and mantle at we find earth crust and it consists of rocks and soil and the next is the core and this core very hot and it is very hard and the next is the mantle it is very hard and very very hot it is nearly 3000^c and from these mantle comes out by the form of larva and it come out when there is a gape between the earth crust and cools down and forms a rock like substance and when these mantle is coming out the land shakes and this shake is called earthquake.    
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