3.1 THE ROCK CYCLE SHOWS HOW ROCKS CHANGE

Vocabulary  ROCK A naturally formed solid that is usually made up of one or more types of minerals  ROCK CYCLE The set of natural processes that form, change, break down and re- form rocks

Most Rocks are made of Minerals = = Crystal structure

Most Rocks are made of Minerals  Rocks are made of different amounts of minerals calcite No Minerals LIMESTONE OBSIDIAN No Minerals COAL

Our World is Built of Rocks  Earth is built almost entirely of rocks  What do you see when you look at the Earth’s surface?  Solid and Molten Rock (between crust and metallic core)

Rocks are used for: Buildings (houses & skyscrapers)

Rocks are used for: Sources of Metal (Fe, Al, Cu)

Rocks are used for: Statues and Other Art

Rocks are used for: Base for Pavement (Roads and Highways)

Rocks in the World Around Us Limestone Granite

Rocks Change as they Move Through the Rock Cycle  Rock Cycle=no beginning or end (continuous)

Rock Types: Igneous Rock  Forms when molten rock cools to a solid  On Earth’s surface or within

Rock Types: Sedimentary Rocks  Forms when pieces of rock, plants, or other loose materials get together  Carried by or

Rock Types: Metamorphic Rocks  Forms fromor pressure  Eventually raised to the surface

Rocks in the Crust  95% metamorphic and igneous  5% sedimentary

More on the Rock Cycle  ROCK CYCLE TEST ROCK CYCLE TEST  Rock Cycle /content/investigations/es0602/es0602page02.cfm /content/investigations/es0602/es0602page02.cfm