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en.wikipedia.org/wiki/Intrusive_rock

Intrusive rock (also called plutonic rock) is formed when magma crystallizes and solidifies underground to form ... Intrusions are one of the two ways igneous rock can form; the other is extrusive rock ... Diagram showing various types of igneous intrusion ... How deep-seated intrusions burst through the overlying strata causes  ...

www.answers.com/Q/What_type_of_rock_can_only_form_deep_underground

Why are metamorphic rocks formed deep underground? metamorphic rocks is found underground because they are formed by heat and pressure and down ...

www.zmescience.com/other/science-abc/types-of-rock

Jun 27, 2017 ... The three main types of geological rocks are described. They are... ... types of rocks are: Igneous; they form from the cooling of magma deep inside the earth. ... They can form both underground and at the surface. Sedimentary .... We depend on electricity now, not only for convenience, but for our very lives.

science.jrank.org/kids/pages/176/Three-Types-Rock.html

One type of rock gets its start deep in the Earth in huge underground pockets. There, the rock is so ... Hardening magma is only one way that rock forms. A second type of ... Certain minerals dissolved in a body of water can form sediments, too.

www.tulane.edu/~sanelson/eens212/typesmetamorph.htm

Mar 14, 2017 ... Low grade metamorphic rocks are generally characterized by an ... in folding of rock and thickening of the crust, which tends to push rocks to deeper levels ... Just like in igneous rocks, minerals can only form if the necessary ...

www.earth.northwestern.edu/public/seth/Demos/XTAL/xtal.html

If the magma cools quickly, the crystals do not have much time to form, so they are very ... Sometimes, a rock will contain both aphanitic and phaneritic crystals in it. ... need time to grow, the magma must have spent some time deep underground. ... If a rock has both crystal types, it means that the mamga spent some time in a ...

www.nationalgeographic.com/science/earth/inside-the-earth/rocks

Learn more about rocks and how they form. ... Types of Rocks. There are three ... They include not only lava spewed from volcanoes, but also rocks like granite, which are formed by magma that solidifies far underground. ... It can also come from subduction, when tectonic forces draw rocks deep beneath the Earth's surface.

www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/rock_cycle/revision/4

The second type of rock we'll look at is igneous rock. ... Molten (liquid) rock forms when rocks melt. ... This can happen if the magma cools deep underground.

www.geologyclass.org/Igneous%20Concepts.htm

Magmas can occur deep within the Earth, or at Earth's surface. Igneous rock- A silicate-rich rock that forms when magma solidifies. ... Intrusive/Plutonic- Igneous rock formed when magma solidifies deep underground (includes granites, the ... and Mg (the dark-colored minerals biotite and amphibole are present, but only in  ...