Definitions and facts for the 3 types of rocks.

1. Rocks
Igneous, Sedimentary and
Metamorphic

2. What is a Rock?
 The material that forms Earth’s hard
surface (crust)

3. Essential Questions
 How are rocks and minerals different?
 Rocks can be made from various minerals and
other materials, while minerals must have a
definite composition.
 What are the three types of rocks?
 Igneous - sedimentary - metamorphic
 How are rocks formed?
 Rocks are made from mixtures of minerals and
other materials.

4. Sedimentary Rock
 Definition
 A type of rock that forms when particles
from other rocks or the remains of plants
and animals are pressed and cemented
together.

5. Sedimentary Rocks
 FACTS
 Fours steps to be formed
 Erosion
 Deposition
 Compaction
 Cementation
 Examples:
 Limestone, sandstone, shale

6. Igneous Rocks
 Definition
 A type of rock that forms from the cooling
of molten rock at or below Earth’s surface
~ “ignis” means fire in Latin

7. Igneous Rocks
 Facts
 Can be “intrusive”  forms Inside earth’s
interior
 Can be “extrusive”  forms on top of
earth’s surface (Exterior)
 Forms from cooled magma or lava
 Examples
 Granite, basalt, pumice

8. Metamorphic Rock
 Definition
 A type of rock that forms from an existing
rock that is changed by heat, pressure or
chemical reactions

9. Metamorphic Rock
 Facts
 Form deep below earth’s surface
 Any type of rock can eventually “morph”
into a metamorphic rock
 Examples
 Marble, slate