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Topic 11:Rocks&Min.s

Pg. (228-231); Metamorphic Rocks & the Rock Cycle.

QuestionAnswer
Describe metamorphic rocks. Rocks formed under extreme heat and pressure via recrystallization.
Explain regional metamorphism. Recrystallization of rock at great depth in the crust due to intense heat and pressure.
Explain contact metamorphism. Metamorphism of sedimentary rock closer to Earths surface due to intense heat released by a magma chamber. Less depth, less pressure, diminished metamorphic rock density.
Discuss foliation: Foliation is layering that occurs during recrystallization as less dense minerals rise slightly and more dense minerals sink slightly during rock formation. A light and dark pattern sometimes emerges as with Gneiss.
What rock forms when sandstone recrystallizes? Quartzite.
How does marble form? Recrystallization of fossil limestone.
Compare sedimentary and metamorphic rocks. Metamorphic are harder, denser, and contain no fossils.
Created by: whearn