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en.wikipedia.org/wiki/Cave

A cave is a hollow place in the ground, specifically a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground. The word cave can also refer to much smaller openings such as sea caves, .... These can form in any type of rock, including hard rocks such as granite.

www.answers.com/Q/What_type_of_rock_can_only_form_deep_underground

Intrusive/Plutonic - Igneous rock formed when magma solidifies deep underground (includes granites, the main rock of the continents). Extrusive/ Volcanic ...

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

Nov 23, 2016 ... Igneous; they form from the cooling of magma deep inside the earth. They often have ... They can form both underground and at the surface.

beyondpenguins.ehe.osu.edu/issue/rocks-and-minerals/the-basics-of-rocks-and-minerals-and-polar-geology

There are over 3,000 named minerals; however, there are really only about 30 ... Magma is molten rock that is underground; lava is molten rock that is above the ... Metamorphic rocks are formed when a rock is buried deep in the earth and is ... The triangle diagram shows how one type of rock can form any other type of rock.

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.earth.northwestern.edu/people/seth/Demos/XTAL/xtal.html

If the magma cools quickly, the crystals do not have much time to form, so they ... An igneous rock with large crystals probably indicates that the rock formed deep within ... 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.tulane.edu/~sanelson/eens212/typesmetamorph.htm

Mar 14, 2017 ... As the temperature and/or pressure increases on a body of rock we say the ... 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 ...

en.wikibooks.org/wiki/High_School_Earth_Science/Formation_of_Minerals

3.1 Minerals from Salt Water; 3.2 Minerals from Hot Underground Water ... Figure 3.20: Granite is a type of rock that forms from magma. ... Water can only hold a certain amount of dissolved minerals and salts. ... lava: Molten rock that has reached the Earth's surface. magma: Molten rock deep inside the Earth. rocks: Mixtures ...

volcano.oregonstate.edu/book/export/html/196

The crust is only 3 miles thick under the oceans and about 40 miles thick under the highest mountain chains. The layer of the ... The rocks can be changed at times to another type of rock. The rock cycle ... Granite forms as magma cools far under the earth's surface. Because it hardens deep underground it cools very slowly.

www.minsocam.org/msa/collectors_corner/id/rock_key.htm

Igneous Rock is formed when a magma cools underground and crystallizes or when ... Sedimentary Rock forms from particles, called sediment, that are worn off other rocks. ... The pressure can come from being buried very deep in the earth's crust, ..... The rock has many thin flat layers, seems to have only one mineral, and  ...