under pressure

NAME
WORKSHEET ANSWERS
UNDER PRESSURE
Metamorphism is classed as low, medium, or high grade, depending on how extreme the
conditions are that produce the rock. Low-grade metamorphosed rocks are often fine-grained,
while high-grade metamorphosed rocks are coarse-grained.
The graph shown here is often used by geologists to identify typical patterns in
metamorphism. Use this graph to complete the table. Read and record suitable temperature
and pressure range values for the grade of metamorphism required to produce that particular
metamorphic rock.
Starting rock
Metamorphic
rock
Required
metamorphism
grade
shale
slate
low
150 - 200
200 - 400
limestone
marble
low, medium, high
0 - 700
200 - 1000
sandstone
quartzite
high
400 - 700
600 - 1000
granite
gneiss
medim, high
200 - 700
600 - 1000
coal
anthracite
very low
0 - 200
0 - 200
shale
schist
medium
200 - 400
400 - 600
ACTIVITY: METAMORPHIC ROCKS
Temperature (Co)
Pressure (MPa)
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NAME
WORKSHEET ANSWERS
UNDER PRESSURE
1
The diagram below represents the microscopic view of sandstone showing the many
quartz grains with spaces in between them.
In the blank diagram provided, draw what you think the rock would look like after being
exposed to heat and pressure for thousands of years.
2
The diagram below represents marble, a metamorphic rock formed from limestone after
many years of exposure to intense heat and pressure.
In the blank diagram provided, draw what you think the limestone (a sedimentary rock
containing shell fragments) would have looked like when it was originally formed.
ACTIVITY: METAMORPHIC ROCKS
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