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SCI 245 Metamorphic Rocks CP Week 6

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Metamorphic rocks are produced from pre-existing rock that has
been altered, but not yet melted by the pressure and heat from the
deep surface of the Earth. The rocks originate from non-
metamorphic rocks that have been changed due to pressure and
temperature. The changes in pressure and temperature of the rocks
cause the minerals to deform and re-crystallize. Most metamorphic
rocks are formed from limestone and slate. If the pressure and heat
increases enough to make a rock melt, magma will form and igneous
rocks will also form. There are two categories of metamorphic rock:
foliated and unfoliated. Foliated and unfoliated are characteristics of
the rocks that describe the di#erent textures. Foliation is the
property a rock has if its minerals are banded. If the minerals are not
banded, they are foliated. Unfoliated rocks occur during
metamorphism, when the rock is composed into its own minerals.
Foliation is measured by the heat, pressure, and stress that the
original rock has experienced during metamorphism.

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