click below
click below
Normal Size Small Size show me how
Topic 11:Rocks&Min.s
Pg. (228-231); Metamorphic Rocks & the Rock Cycle.
Question | Answer |
---|---|
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. |