What is an igneous intrusion?

1 Answer
Don Mac
Apr 14, 2016

Molten rock called "magma" that intrudes or invades shallower rocks.

Explanation:

Igneous intrusions consist of molten magma that rises up from the mantel (because they have less density) and intrude into other rocks. They are of two types: 1) intrusive and 2) extrusive. Intrusive rocks move upward in the crust but cool before they break the surface; while extrusive rocks break the surface and form volcanoes and fissures. See pic.

http://drannabalog.com/Phisical/chapter%204.igneous%20rocks.htm

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