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en.wikipedia.org/wiki/Igneous_rock

Igneous rock or magmatic rock, 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 ... Intrusive igneous rocks that form at depth within the crust are termed plutonic (or abyssal) rocks and are usually coarse-grained.

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

When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have ...

www.answers.com/Q/As_the_rate_of_cooling_increase_the_size_of_the_crystals_that_form

The size of the crystals that do form are smaller/microscopic in that the time an temperature for crystals to grow is cut. ... As the rate of cooling increase the size of the crystals that form? .... The size of crystals decreases as the cooling increases.

www.coursehero.com/file/7654704/Chapter-02Test

Mar 19, 2013 ... As the rate of cooling increases (speeds up), the size of the crystals that form ... Intrusive rocks ______. a. are generally fine grained b. form at ...

issuu.com/eric410/docs/test-bank-foundations-of-earth-scie_ecfa8ffded5893

Jan 16, 2017 ... ... contains many small holes D) all of the above Answer: D Diff: 1 2) As the rate of cooling increases, the size of the crystals that form ______.

www.rsc.org/education/teachers/resources/jesei/cooling

It can be used to illustrate how the rate at which molten rock cools affects the size of the crystals that form within the solid rock – rapid cooling producing small ...

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

Feb 12, 2004 ... Magma can cool to form an igneous rock either on the surface of the Earth - in ... magmas (viscosity increases with increasing SiO2 concentration in the magma). ... Note that the rate of crystal growth and nucleation depends on how ... in a porphyritic texture, a texture with two or more distinct sizes of grains.

www.tulane.edu/~sanelson/eens212/intro&textures.htm

Jan 9, 2015 ... Magma can cool to form an igneous rock either on the surface of the Earth ... content magmas (viscosity increases with increasing SiO2 concentration in the magma). ..... At larger degrees of undercooling, the nucleation rate will be high and the ... If the size of the grains are so small that crystals cannot be ...

academic.brooklyn.cuny.edu/geology/leveson/core/topics/rocks/ans_check_texture.html

All three can form rocks with crystalline texture. ... Melts: HINT: How does cooling rate affect grain size? ... Describe a situation in nature where a melt begins to cool at one rate and then is placed in a new situation where the rate of cooling increases, and eventually ... Well-formed crystals can form in all three types of rocks.

www.indiana.edu/~geol105/1425chap5.htm

A) during the cooling of molten materials (steel, from lavas, igneous rocks). ... All of these minerals form through crystallization from silicate melts in the crust and mantle. ... Magma is molten silicate material and may include already formed crystals and dissolved gases ..... The rate of diffusion also increases with temperature.