The rock which forms outermost layer of the earth.

heavy rocks

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 P, S and L waves.

earthquake waves

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Name the three layers of the earth


 The three layers of the earth are :

(i) The crust,

(ii) The mantle and

(iii) The core.
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The layer whose density varies from 2.75 to 2.90.

crust

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What are the two main materials of the earth’s core ?

They are:

(i)Nickel

(ii)Iron
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