Rocks

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.