1. Rocks
3 Main Types

2. What are ROCKS?
A rock is a naturally occurring solid mixture of one or more minerals, or organic matter
Rocks are classified by how they are formed, their composition, and texture
Rocks change over time through the rock cycle

3. Three Major Types of Rocks
Igneous
Sedimentary
Metamorphic
Formed when magma (or lava) cools and hardens.
Formed from particles of sand, shells, pebbles, and other fragments of material
Form under the surface of the Earth from the change due to intense heat and pressure.

4. Some Characteristics to look for…

5. How Rocks Change…
All rocks are constantly changing VERY SLOWLY from one type to another, again and again.
Rocks change due to:
Heat and Pressure
Melting
Cooling
Weathering and Erosion
Compacting and Cementing

6. Heat and Pressure

7. Melting

8. Cooling
Magma Cooling
Lava Cooling OR

9. Weathering and Erosion

10. Compacting and Cementing