Geology Interview Question:

Contrast the process that forms igneous rocks with the process that form metamorphic rocks.

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Igneous rocks form in quite a different way to metamorphic rocks.

Igneous rocks form due to heat and volcanic activity specifically they form when molten rock cools and becomes solid.

However, metamorphic rocks are existing rocks - perhaps igneous ones - that have been changed by great pressure and often-great heat into metamorphic rocks.
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