GEOLOGY 1010 EXAM 2 (Latest Update
) Questions with Correct
Answers 100% Verified {Grade A} -
CLEMSON
Why do we care about metamorphism? - correct answer - good for geological history
What causes metamorphism? - correct answer - made form increasing temperatures
or pressures
(gets rid of old minerals, replaced with new)
Geothermal Gradient - correct answer - how quickly a temperature increases with
depth (below surface)
- varies with location
,What is the average geothermal gradient? - correct answer - 30 degC/km (if you were
to drill a hole 1 km anywhere on the earth)
- Typical range: 20-60 degC/km
ex: high - 200 degC/km
low - 10 degC/km
When you are close to a subduction zone, what is the geothermal gradient? - correct
answer - geothermal gradient is low
- need to go very deep before getting to a hot temperature
Contact Metamorphism Change - correct answer -magma comes in contact with
rocks. make them become metamorphic
-solely driven by temperature
-LOCALIZED
rock is a good insulator for heat
,effects small scale geographically
(metamorphism via heat)
What is pressure measured in? - correct answer - pascals or bars
What is a bar equal to? - correct answer - 1 bar = atmospheric pressure at surface
*works with metric system (kilobars, centibars)
Pressure Gradient - correct answer - ~300 bar/km depth
*(little) variation in location
Confining Pressure - correct answer - squeezing or applying pressure evenly from
every direction
*think of a cube
, Directed Pressure - correct answer - *aka differential stress*
- pressure from ONE direction
How do metamorphic rocks get back to the surface? - correct answer - Faults push
rocks up and overtime through weathering, metamorphic rocks are exposed
Regional Metamorphism - correct answer - metamorphism via pressure
- large scale (east or west coast would experience at a time)
- caused by plate collision
-common places: subduction zone
Fault Metamorphism - correct answer - metamorphism via pressure
- trying to grind past each other
- localized (not large scale)
- pressure change
) Questions with Correct
Answers 100% Verified {Grade A} -
CLEMSON
Why do we care about metamorphism? - correct answer - good for geological history
What causes metamorphism? - correct answer - made form increasing temperatures
or pressures
(gets rid of old minerals, replaced with new)
Geothermal Gradient - correct answer - how quickly a temperature increases with
depth (below surface)
- varies with location
,What is the average geothermal gradient? - correct answer - 30 degC/km (if you were
to drill a hole 1 km anywhere on the earth)
- Typical range: 20-60 degC/km
ex: high - 200 degC/km
low - 10 degC/km
When you are close to a subduction zone, what is the geothermal gradient? - correct
answer - geothermal gradient is low
- need to go very deep before getting to a hot temperature
Contact Metamorphism Change - correct answer -magma comes in contact with
rocks. make them become metamorphic
-solely driven by temperature
-LOCALIZED
rock is a good insulator for heat
,effects small scale geographically
(metamorphism via heat)
What is pressure measured in? - correct answer - pascals or bars
What is a bar equal to? - correct answer - 1 bar = atmospheric pressure at surface
*works with metric system (kilobars, centibars)
Pressure Gradient - correct answer - ~300 bar/km depth
*(little) variation in location
Confining Pressure - correct answer - squeezing or applying pressure evenly from
every direction
*think of a cube
, Directed Pressure - correct answer - *aka differential stress*
- pressure from ONE direction
How do metamorphic rocks get back to the surface? - correct answer - Faults push
rocks up and overtime through weathering, metamorphic rocks are exposed
Regional Metamorphism - correct answer - metamorphism via pressure
- large scale (east or west coast would experience at a time)
- caused by plate collision
-common places: subduction zone
Fault Metamorphism - correct answer - metamorphism via pressure
- trying to grind past each other
- localized (not large scale)
- pressure change
