1. 3 Types of Rocks

2. How Igneous Rocks Form:
When molten rock (lava) cools and becomes solid
Intrusive: cools slowly
Extrusive: cools quickly

3. Description of Igneous Rocks:
Contains bubble-like holes
Hard
Bubbly texture
Formed above or below earth’s surface

4. Examples of Igneous Rocks:
Granite
Basalt
Pumice

5. How Metamorphic Rocks Form:
When heat and pressure cause older rocks to change into new types
Formed deep in the earth

6. Description of Metamorphic:
Fine texture
Has bands or streaks of minerals
Usually made of quartz and calcite

7. Examples of Metamorphic:
Marble – comes from limestone
Slate – comes from shale
Quartzite – comes from sandstone

8. How Sedimentary Rocks Form:
When rocks, plants, and loose material get pressed into layers over time
Involves weathering and erosion

9. Description of Sedimentary:
Has layered features
Very soft (easily scratched)
Contains fossils
Made of particles cemented (pressed) together

10. Sedimentary Examples:
Limestone – made from seashells
Shale – made from mud
Sandstone – made from sand