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25 January 2008
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Schools GCSE Bitesize Revision
Chemistry Changes to Earth and its atmosphere

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Home / Chemistry / Changes to Earth and its atmosphere / Rocks and the Rock Cycle

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Rocks and the Rock Cycle


Layers of rocks can be faulted, folded and tilted by large forces within the Earth's crust. The study of these changes can give information about the strength and direction of the forces involved.

Sedimentary rocks - layers of rock fragments that were compressed and cemented together. They often contain fossils.
Igneous rocks - molten rock that cools and solidifies. They do not contain fossils.
Metamorphic rocks - existing rocks that are compressed and heated without melting. They have the same chemical composition as the rocks from which they were made.

  1. Sedimentary rocks
  2. Igneous rocks
  3. Metamorphic rocks
  4. The rock cycle
  5. Evidence for movement
http://www.bbc.co.uk/gcsebitesize Intro 1 2 3 4 5 Print
crust
The crust is the outermost layer of the Earth.
fossils
Fossils are the remains of animals and plants from a past geological age, preserved in the earth's crust.
igneous
Igneous rocks are formed when molten rock cools.
sedimentary
Sedimentary rocks are formed when rock fragments are deposited and pressed together.
weathering
Weathering is the gradual breaking down of rocks by rainwater and changes in temperature.
erosion
Erosion is the process whereby rock or soil is worn away by the action of the wind, waves or water.
Metamorphic
Metamorphic rocks are formed when rocks are changed by heat or pressure.
mantle
The mantle is the region of the Earth's interior between the crust and the Earth's core .
magma
Magma is molten rock.


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