An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet.

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Wikipedia contributors. (2023, August 28). Intrusive rock. In Wikipedia, The Free Encyclopedia. Retrieved October 29, 2023, from https://en.wikipedia.org/w/index.php?title=Intrusive_rock&oldid=1172656316

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The sun also ariseth, and the sun goeth down, and hasteth to his place where he arose. Ecclesiastes 1:5 KJV

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Intrusive rock (Wikipedia) Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks.

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Intrusive rocks are characterized by large crystal sizes, and as the individual crystals are visible, the rock is called phaneritic.

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