envshomework2

envshomework2 - Aubrey McMillan Homework #2 Exercise 1A:...

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Aubrey McMillan Homework #2 Exercise 1A: The rock cycle refers to the geologic transitions among sedimentary, metamorphic, and igneous rock. Igneous rocks are formed from molten rock (when it solidifies). This molten rock may come from the melting of metamorphic, sedimentary, or preexisting igneous rocks. Metamorphic rock forms when heat, pressure, and chemical reactions alter igneous, sedimentary, or preexisting metamorphic rocks. This metamorphism occurs when the chemical environment (heat and pressure) cause minerals in the rock unstable. Thus, the rock changes by growing new minerals or recrystallizing minerals. Metamorphism usually occurs deep under the ground – under active mountain belts and around volcanoes. Sedimentary rocks can form wherever sediments accumulate (i.e. in ocean basins, coasts, river channels, and in basins between mountains). A source of sediments for burial and an environment that allows for sediment accumulation are needed. Sediments usually originate from the weathering of rocks.
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This note was uploaded on 04/18/2011 for the course ENV S 2 taught by Professor Keller during the Winter '09 term at UCSB.

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envshomework2 - Aubrey McMillan Homework #2 Exercise 1A:...

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