An intrusion is an igneous rock body that forms from crystallized magma under Earth's surface.
https://en.wikipedia.org/wiki/Intrusion
Extrusive or volcanic rocks crystallize from lava at the earth's surface. The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals.
http://www.columbia.edu/%7Evjd1/igneous.htm
Magma slowly pushes up from deep within the earth into any cracks or spaces it can find, sometimes pushing existing country rock out of the way, a process that can take millions of years. As the rock slowly cools into a solid, the different parts of the magma crystallize into minerals.
https://en.wikipedia.org/wiki/Intrusion
Intrusive structures are often classified according to whether or not they are parallel to the bedding planes or foliation of the country rock: if the intrusion is parallel the body is concordant, otherwise it is discordant. A well-known example of an intrusion is Devils Tower.
https://en.wikipedia.org/wiki/Intrusion
Igneous Rocks. Of the three principal rock types (igneous, sedimentary, and metamorphic), igneous rocks can be thought of as primary rocks because they crystallize from a liquid. Sedimentary and metamorphic rocks, which we will study later, may be thought of as derivative rocks. Igneous rocks are rocks formed from the crystallization of a liquid (molten rock). Igneous rocks may be divided into two categories. Intrusive or plutonic rocks crystallize from magma beneath the earth's surface.
http://www.columbia.edu/%7Evjd1/igneous.htm
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https://quizlet.com/1193652/geography-flash-cards/
Igneous rocks that cool quickly on Earth’s surface are ____. a. extrusive c. metamorphic b. intrusive d. always magnetic ____ 15. Extrusive rocks, which cool more rapidly than intrusive rocks, are generally more ____. a. coarsely grained c. radioactive b. finely grained d. magnetic ____ 16.
http://reviewearthscience.com/subjects/es/review/tests/Online_Tests/long/pdfs/Ig_Rocks.pdf
Technically speaking, an intrusion is any formation of intrusive igneous rock; rock formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock; rock formed above the surface of the crust.
https://en.wikipedia.org/wiki/Intrusion
Many mountain ranges, such as the Sierra Nevada in California, are formed mostly by intrusive rock, large granite (or related rock) formations. Intrusions are one of the two ways igneous rock can form; the other is extrusive, that is, a volcanic eruption or similar event.
https://en.wikipedia.org/wiki/Intrusion
Valuable ore deposits and gem crystals are often associated with ____. a. oceans c. thin crustal areas b. oil deposits d. igneous intrusions Completion Complete each sentence or statement. 18. Rock formed from the crystallization of magma is called _________________________. 19.
http://reviewearthscience.com/subjects/es/review/tests/Online_Tests/long/pdfs/Ig_Rocks.pdf
what rocks have cooled slowly beneath the earth's surface
Magma which is a type of rock have cooled slowly the Earth's surface. The rocks that have cooled slowly beneath the earth's surface are called magma.