1. Classification of Rocks
Each rock type is classified by how they are formed
The 3 Rock Types
Igneous
Sedimentary
Metamorphic
What makes them different?
What do they have in common?

2. (over geologic time) into another type of rock
Igneous Rocks
Formed from the cooling and crystallization of lava
or magma (molten rock)
Intrusive or Extrusive
Mafic or Felsic
Metamorphic Rocks
Formed by heat and pressure changing other rocks
Foliated or non-foliated
Sedimentary Rocks
Formed by the compaction and cementation of sediments into layers of rock
Clastic (rock fragments) OR
Nonclastic:
Chemical
Organic
All rocks
Can be composed of minerals, volcanic glass, organic matter, or other materials
Can be changed
(over geologic time) into another type of rock
Recycled

3. The Rock Cycle
All rocks are in a constant (although extremely slow) state of change due to:
Weathering and erosion (breaks rocks into sediments)
Compaction and cementation (creates new Sedimentary rocks)
Movement of Earth’s crust (causes pressure and heat)
Volcanic activity (melts rocks into magma and creates igneous rocks)
The Rock Cycle shows how one rock type can transform into another type of rock.

6. Rock Cycle

7. Rock Cycle

8. Sedimentary

9. Igneous

10. Igneous

11. Metamorphic

12. Geothermal

13. Rock Type Venn Diagram Igneous Rock Sedimentary Rock All Rock Types
Metamorphic Rock