rock cycle - Igneous rocks Igneous rocks form from the...

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Igneous rocks •        Igneous rocks form from the cooling of magma or lava •        Magma is hot, molten, si-rich, material.  It also contains dissolved water and gases and suspended mineral crystals. •        Lava is magma that has reached the Earth’s surface •        Igneous rocks are made up of interlocking crystals of predominantly silicate minerals •        Igneous rocks are classified by where they form •        Plutonic (intrusive): cool slowly below Earth’s surface. Large, visible crystals, ex: granite •        Volcanic (extrusive): cool rapidly at Earth’s surface. Tiny crystals or glassy appearance, ex: rhyolite Sedimentary Rocks •        Sedimentary rocks form from the breakdown of preexisting rocks •        Sediments are loose accumulations of mineral and rock particles that have been transported by water, wind, or ice. Lithification turns loose sediment into
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This note was uploaded on 03/19/2008 for the course GEOS 1024 taught by Professor Meschreiber during the Spring '08 term at Virginia Tech.

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rock cycle - Igneous rocks Igneous rocks form from the...

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