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rock forming mineral

20 minerals make up most of Earth's crust.


generally a light colored rock that has high silica content.


dark colored rock that has lower silica content.


particles of minerals or other rocks.


the look and feel of a rock's surface.

igneous rock

forms from the cooling of magma or lava.

sedimentary rock

forms when small particles of rock or plant and animal remains are squeezed together below the surface.

metamorphic rock

forms when a rock is changed by heat, pressure, or chemical reactions deep underground.

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