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How Isostacy, Orogeny, and Metamorphism are Interrelated
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1

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Which statement best describes the principle of isostacy?
A)The Earth's lithosphere tends to remain at a stable equilibrium position relative to the asthenosphere.
B)The Earth's lithosphere is similar in average composition around the planet.
C)Metamorphism of surface rock occurs to the same degree across the roots of a mountain belt.
D)The lithosphere of the Earth adjusts to a floating equilibrium on the underlying asthenosphere.
E)The dense lithosphere sinks into the underlying asthenosphere.
2
What happens to continental lithosphere during an orogeny?
A)the lithosphere is thinned
B)the lithosphere thickens
C)the lithosphere subsides into the asthenosphere
D)both a and c
E)both b and c
3
What happens to a mountain belt as it erodes through time?
A)the mountains become lower at a constant rate
B)the lithosphere subsides as the weight of the mountains is removed
C)the lithosphere rebounds, replacing some of the elevation lost to erosion
D)the deep roots of the mountains become exposed at the surface
E)both c and d
4
How would you identify the high peaks region of an ancient, eroded mountain belt?
A)the bedrock associated with the highest elevations will have the most faults
B)the bedrock associated with the highest elevations will have the highest grade of metamorphic rock
C)the bedrock associated with the highest elevations will have the lowest grade of metamorphic rock
D)the bedrock associated with the highest elevations will not be metamorphosed
E)the bedrock associated with the highest elevations will occur on the outside of the metamorphic belt
5
Which statement best describes isostatic rebound?
A)uplift of the crust due to a change in the isostatic equilibrium
B)subsidence of the crust due to a change in the isostatic equilibrium
C)uplift of the crust due to a change in the elastic property of the rock
D)subsidence of the crust due to a change in the density of the rock
E)both b and d





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