1. 3 Groups of Rocks

2. There are only 3 groups of rocks, each is determined by how the rock formed
All rocks are made from minerals

3. Igneous formed when melted rocks cool and harden

4. 2 Types EXTRUSIVE: Lava cooling on surface INTRUSIVE:
Magma cooling in crust (Usually slow)

5. Some common ones are:
Obsidian
Granite
Pumice
Diorite

6. Metamorphic Rocks that are changed by extreme heat and pressure.
Often found near mountains and deep in Earth

7. 2 types: Nonfoliated Foliated Random mineral arrangement
minerals arranged in layers or bands

8. Common Examples:
Marble
Schist
Gneiss
Slate
quartzite

9. Sedimentary Rock
When broken up pieces of rocks become compacted and cemented together.

10. Usually found in places that were below water
Made by weathering, erosion, deposition, compaction, and then cementation
Usually found in places that were below water

11. Common Examples
Sandstone
Limestone
Conglomerate
shale

12. The Rock Cycle

13. It is the continual process that changes any type of rock into a different kind of rock.
The cycle is very slow and never ending

14. Follow the arrows and 1 rock can turn into any of the other rock types.
Erosion, deposition, compaction, and cementation
Igneous Rock
Sedimentary Rock
Heat and pressure
Cooling
Melting
Heat and pressure
Erosion, deposition, compaction, & cementation
Melting
Melting
Magma
Metamorphic Rock