The Rock Cycle
Published on Nov 30, 2016
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PRESENTATION OUTLINE
The Rock Cycle
Where do rocks come from?
The rock cycle is Earth's natural process of recycling rocks and sediments.
There are three types of rocks.
Igneous rocks are formed from magma, the molten form of Earth's mantle layer. They can form from a volcano's lava, or they may form under the Earth's surface.
Photo by Camera John
Sedimentary rocks form from weathered pieces of other rocks or from shells of sea creatures. These rocks are squeezed and cemented together.
Photo by brittgow
Metamorphic rocks form always start out as other rocks, but form under intense heat and pressure.
Photo by sunphlo
How rocks change...
- Igneous or sedimentary rocks can become metamorphic with intense heat and pressure.
- Igneous or metamorphic rocks can be broken down (weathered) and then compressed into a sedimentary rock.
- Sedimentary or metamorphic rocks may rejoin the molten layer and become igneous.
