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Metamorphic rocks

A metamorphic rock is a result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes. Examples of these rock types include marble, slate, gneiss, schist.
http://www.onegeology.org/extra/kids/metamorphic.html

Igneous rock

The first rocks on Earth were igneous rocks. Igneous rocks are formed by the cooling and hardening of a molten material called magma. The word igneous comes from the Latin word ignis, meaning fire. There are two types of igneous rocks: intrusive and extrusive. Intrusive igneous rocks from within Earth's crust; the molten material rises, filling any available crevices, into the crust, and eventually hardens. These rocks are not visible until the Earth above them has eroded away. Intrusive rocks are also called plutonic rocks, named after the Greek god Pluto, god of the underworld
http://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/igneous-rocks

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Design and share beautiful flyers just like this one! Spread the word with an online flyer. They're easy to make and impossible to mess up :) Try it now A metamorphic rock is a result of a transformation of a pre-existing rock.

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Source 1
http://geology.com/rocks/
https://www.learner.org/interactives/rockcycle/types.html

Source 2
http://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/igneous-rocks

Source 3

http://www.onegeology.org/extra/kids/metamorphic.html

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One of the most important things about the geology on the moon is your descriptions of what you see, comparing them to things that you've seen on Earth so that the geologists and the scientists on the ground would know what you're talking about; and then take pictures of them -Eugene Cernan

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At Olduvai, for 20 years, Mary and I had investigated and made a general survey of the overall geology -Louis Leakey

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The word "igneous" comes from the Latin word "ignis" which means "of fire."

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Man can be understood only by ascending from physics, chemistry, biology, and geology. In other words, he is first of all a cosmic problem.