Explain the formation of intrusive rocks.
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Intrusive igneous rock is formed when magma cools and solidifies within small pockets contained within the planet’s crust. As this rock is surrounded by pre-existing rock, the magma cools slowly, which results in it being coarse grained – i.e. mineral grains are big enough to be identifiable with the naked eye. The most common types of plutonic igneous rock are granite, gabbro, or diorite.
The central cores of major mountain ranges consist of large bodies of intrusive igneous rocks – also known as batholiths – since they are the result of magma cooling within preexisting solid rock on the surface. In addition to batholiths, other types of igneous rock structures include stocks, laccoliths, lopoliths, phacolith, chonliths, sills, dikes, and volcanic pipes (or necks). All of these are to be found in subterranean layers, but can sometimes breach the surface due to tectonic activity.
The central cores of major mountain ranges consist of large bodies of intrusive igneous rocks – also known as batholiths – since they are the result of magma cooling within preexisting solid rock on the surface. In addition to batholiths, other types of igneous rock structures include stocks, laccoliths, lopoliths, phacolith, chonliths, sills, dikes, and volcanic pipes (or necks). All of these are to be found in subterranean layers, but can sometimes breach the surface due to tectonic activity.
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