EOSC 110 MIDTERM 1 LATEST
What forces drive metamorphism? - ANSWERS-1. Changes in
Temperature
2. Changes in Pressure
3. Fluids
What is the geothermal gradient? - ANSWERS-The amount of increase
in temperature with depth in Earth.
What is the average geothermal gradient? - ANSWERS-25C/KM depth
What does lithostatic mean? - ANSWERS-Increase in pressure equal in
all directions
Can compressive stress produce foliation? - ANSWERS-Yes, but only
with very platy minerals.
What changes in rocks during metamorphism? - ANSWERS-1.
Recrystallization (coarsening)
2. Formation of new minerals
3. Foliation
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PAGE
1
, EOSC 110 MIDTERM 1 LATEST
Contact metamorphism - ANSWERS-Adjacent to intrusions in shallow
crust, country rock heated by conduction and hydrothermal convection
Regional metamorphism - ANSWERS-Occurs over large areas of the
crust due to increased P-T at depths >5KM
What does contact metamorphism result in? - ANSWERS-
Recrystallization, new minerals, veins form
What does regional metamorphism result in? - ANSWERS-
Recrystallization, new minerals form, metamorphism foliation develops
Three stages of divergent boundary? - ANSWERS-1. Rift valley
2. Continued rifting
3. Mature ocean basin
What are the layers of Earth and what are they like? - ANSWERS-1.
Inner Core (solid)
2. Outer Core (liquid)
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PAGE
2
What forces drive metamorphism? - ANSWERS-1. Changes in
Temperature
2. Changes in Pressure
3. Fluids
What is the geothermal gradient? - ANSWERS-The amount of increase
in temperature with depth in Earth.
What is the average geothermal gradient? - ANSWERS-25C/KM depth
What does lithostatic mean? - ANSWERS-Increase in pressure equal in
all directions
Can compressive stress produce foliation? - ANSWERS-Yes, but only
with very platy minerals.
What changes in rocks during metamorphism? - ANSWERS-1.
Recrystallization (coarsening)
2. Formation of new minerals
3. Foliation
END OF
PAGE
1
, EOSC 110 MIDTERM 1 LATEST
Contact metamorphism - ANSWERS-Adjacent to intrusions in shallow
crust, country rock heated by conduction and hydrothermal convection
Regional metamorphism - ANSWERS-Occurs over large areas of the
crust due to increased P-T at depths >5KM
What does contact metamorphism result in? - ANSWERS-
Recrystallization, new minerals, veins form
What does regional metamorphism result in? - ANSWERS-
Recrystallization, new minerals form, metamorphism foliation develops
Three stages of divergent boundary? - ANSWERS-1. Rift valley
2. Continued rifting
3. Mature ocean basin
What are the layers of Earth and what are they like? - ANSWERS-1.
Inner Core (solid)
2. Outer Core (liquid)
END OF
PAGE
2
