Which statement best describes the formation of metamorphic rocks? 1. Magma cools and crystallizes slowly beneath Earth’s surface. 2. Liquid lava erupts from a volcano and cools quickly at Earth’s surface. 3. Sand and gravel are deposited at the mouth of a river and, over time, form layers that solidify into rock. 4. Ancient sandstone beaches become buried deep beneath the Earth’s surface, where they are exposed to extreme heat and pressure.

4. Ancient sandstone beaches become buried deep beneath the Earth’s surface, where they are exposed to extreme heat and pressure.

Explanation:

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.

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