______ rocks are formed when magma cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust
igneous
______ rocks are composed of many, smaller rocks. They are formed through weathering and erosion.
sedimentary
____ rocks is formed when it is exposed to high heat, high pressure, or to a hot, mineral-rich fluid. The existing rock must remain solid and not melt.
metamorphic
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