ROCKS
We have 3 main groups of rocks:
- igneous rock (intrusive that are formed under the surface of the Earth and extrusive that are formed at the surface as volcanoes)
- sedimentary rock (are formed at the surface of the Earth, create the layers)
- metamorphic rock (are formed underground, mix of sedimentary and igneous)
- igneous rock (intrusive that are formed under the surface of the Earth and extrusive that are formed at the surface as volcanoes)
- sedimentary rock (are formed at the surface of the Earth, create the layers)
- metamorphic rock (are formed underground, mix of sedimentary and igneous)
The ROCK CYCLE
The Rock Cycle is a term used by geologists to describe the way rocks form on Earth. It defines the process by which the three main groups of rocks are formed.
For more interesting information check out the article below
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Rocks and rock cycle videos
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For a hands on rock experiment go to assignments.