Rocks

RocksIgneous, Sedimentary and Metamorphic

What is a Rock? The material that forms Earth’s hard

surface (crust)

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.

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.

Sedimentary Rocks FACTS

Fours steps to be formed Erosion Deposition Compaction Cementation

Examples: Limestone, sandstone, shale

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

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

Metamorphic Rock Definition

A type of rock that forms from an existing rock that is changed by heat, pressure or chemical reactions

Metamorphic Rock Facts

Form deep below earth’s surface Any type of rock can eventually “morph”

into a metamorphic rock Examples

Marble, slate