Question

why are there discontinuities in the interior of the earth
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Answer 1

Answer:

The discontinuities are caused by the fact that the whole of the Earth was once molten - ie a ball of liquid.Some of the layering in the Earth today is a result of pressure. Olivine for example is a predominent mineral in the upper mantle, but is unstable below about 500 kilometers and is transformed into wadsleyite.

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Answer 2

Explanation:

The discontinuities are caused by the fact that the whole of the Earth was once molten - ie a ball of liquid. ... Some of the layering in the Earth today is a result of pressure. Olivine for example is a predominent mineral in the upper mantle, but is unstable below about 500 kilometers and is transformed into wadsleyite..

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