Intrusive
These two terms are used to classify igneous rock. Intrusive igneous rock has solidified from magma, below the surface of the Earth. Extrusive igneous rock has solidified from … lava, at or near the surface of the Earth. Intrusive rock displays a coarse-grained rock texture, a result of the slow cooling of magma. Igneous rocks can be classified into two main categories: intrusive and extrusive. A trick to help kids remember intrusive and extrusive is to think of in trusive -- in side and ex trusive -- ex it. Intrusive rocks come from magma. They cool slowly deep in Earth's crust. Intrusive Igneous Rocks. Intrusive, or plutonic, igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals. Examples include granite, gabbro, diorite and dunite. Mineral Photos courtesy of R.Weller/Cochise College. Intrusive and extrusive are formed when lava or magma solidifies. Intrusive igneous rocks form when magma cools beneath the Earth's crust, while extrusive igneous rocks form w … hen lava cools above the Earth's crust. 18 people found this useful. Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene. The specimen shown is about two inches (five centimeters) across. Gabbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, pyroxene and sometimes olivine. Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. Intrusive, or plutonic, igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals. Examples include granite, gabbro, diorite and dunite. Mineral Photos courtesy of R.Weller/Cochise College.
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is dunite extrusive or intrusive