There are 3 large classifications of rocks - igneous, metamorphic, and sedimentary. Each type of rock is formed differently and can change from one type to another over time. The way rocks are formed determines how we classify them.
Metamorphic Rocks
- Forms when rocks are changed into different kinds of rocks by great heat and/or pressure - they are heated, squeezed, folded, or chemically changed by contact with hot fluids and/or tectonic forces.
- When heat and pressure reach the rock's melting point, it melts into magma.
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Topic Tip
- Metamorphic rocks are made by extreme heat and pressure.