Igneous rocks are formed from the solidification of molten rock material. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains. Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. What are Igneous Rocks? Examples of intrusive igneous rocks are diabase, diorite, gabbro, granite, pegmatite, and peridotite. Igneous rock is formed through the cooling and solidification of magma or lava. Solidification into rock occurs either … As per Wikipedia, “Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic.Igneous rock is formed through the cooling and solidification of magma or lava. If they erupt from volcanoes onto the surface as lava, they are called extrusive rocks.By contrast, Intrusive rocks are formed from magma that cools underground. There are two basic types. Igneous rocks are those that form via the process of melting and cooling. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition.
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