Question

(b) The metamorphic rocks are the hardest and the most compact rocks.​

Answer 1

Answer:

Metamorphic rocks are almost always harder than sedimentary because they have gone many processe . They are generally as hard and sometimes harder than igneous rocks. They form the roots of many mountain chains and are exposed to the surface after the softer outer layers of rocks are eroded away.

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Answer 2

Answer:

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