How do geologists use metamorphic rocks to understand Earth’s past? Give two examples of metamorphic rocks, and what we might interpret about Earth’s past from those samples. How are these metamorphic rocks also economic resources?

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When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?