ROCKS
The Rock Cycle
Igneous Rock
Igneous rock forms when moltenmaterial, or magma, cools and hardens.
Examples: granite, obsidian, pumice
IGNEOUS ROCKS
Metamorphic Rock Metamorphic rocks form when heat or
pressure or both cause changes in the othertwo types of rock.
Examples are: marble, slate and quartzite.
METAMORPHICROCKS
Sedimentary RockSedimentary rock forms when small pieces of clay, silt
or sand settle into layers on the bottoms of lakes and oceans. The pressure of the water and the layers
above compress the pieces into rock.
Examples: sandstone, limestone, shale
SEDIMENTARYROCKS
IgneousRock
MetamorphicRock
SedimentaryRock
THE ROCK CYCLE
CREDITS
The Mailbox Magazine for Teachers
Three Rocks. United Learning. 2003. Discovery Education. 12 December 2008<http://streaming.discoveryeducation.com/>
http://www.kidsgeo.com/geology-for-kids/0028-metamorphic-rocks.php
All photographs are my own.
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