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- Intrusive igneous rocks are formed when magma solidifies within Earth1234. They are also known as plutonic rocks1. Intrusive igneous rocks are generally wholly crystalline and characterized by large crystal sizes visible to the naked eye because they cool slowly134. The mineral grains in such rocks can generally be identified with the naked eye4.Characteristics of intrusive igneous rocks include53:
- They cool from magma slowly in the crust.
- They have large crystals.
- Texture reflects how an igneous rock formed.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Intrusive igneous rocks solidify within Earth. These rocks are also known as plutonic rocks—named for Pluto, the Roman god of the underworld. Intrusive igneous rocks are generally wholly crystalline and characterized by large crystal sizes visible to the naked eye because they cool slowly.www.nps.gov/subjects/geology/igneous.htmIntrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Great globs of molten rock rise toward the surface. Some of the magma may feed volcanoes on the Earth's surface, but most remains trapped below, where it cools very slowly over many thousands or millions of years until it solidifies.www.usgs.gov/faqs/what-are-igneous-rocksIntrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals.geology.com/rocks/igneous-rocks.shtmlBodies of intrusive rock are known as intrusions and are surrounded by pre-existing rock (called country rock). The country rock is an excellent thermal insulator, so the magma cools slowly, and intrusive rocks are coarse-grained (phaneritic). The mineral grains in such rocks can generally be identified with the naked eye.en.wikipedia.org/wiki/Igneous_rockWhat are three characteristics of intrusive igneous rocks?
- Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals.
- Extrusive igneous rocks cool from lava rapidly at the surface. They have small crystals.
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