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An '''intrusion''' is a body of [[igneous rock]] that invades older [[rock]]. This may be by forceful '''intrusion''' or by [[magmatic sloping]].
=Sources=
==Sources==
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995), ''p. 251''
[[category:geology]]
[[Category:Volcanology]]