1. 6.3 – Metamorphic Rocks

2. Causes of Metamorphism
Pressure and temp increase with depth
When high temp and pressure combine to alter texture, mineralogy, or chemical composition of a rock without melting it, a metamorphic rock forms
The high temps required for this ultimately are derived from Earth’s internal heat
The high pressures are caused by pressure from the overlying rocks or compressive forces generated during mountain building

3. The Rock Cycle
Metamorphic rocks are formed by the changing of other rocks
Igneous, sedimentary, and metamorphic rocks are grouped according to how they form
Igneous form from magma, sedimentary from sediments, and metamorphic form from temp and pressure