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(11) If an area having 35 km thick crust is thickened by thrusting a 10 km...

(11) If an area having 35 km thick crust is thickened by thrusting a 10 km thick slab of crust on

top, how will the surface elevation change? 2 points

(1) Surface elevation will increase by ~ 1 km

(2) Surface elevation will increase by ~2 km

(3) Surface elevation will increase by ~3 km

(4) Surface elevation will decrease by ~1 km

(5) Surface elevation will decrease by ~2 km

(12) If an area having 35 km thick crust is thickened by thrusting a 10 km thick slab of crust on

top, what will happen to the level of the Moho? 2 points

(1) Moho will rise by ~ 8 km

(2) Moho will rise by ~ 4 km

(3) Moho depth will not change

(4) Moho will move downward by ~ 2 km

(5) Moho will move downward by ~ 8 km

(6) Moho will move downward by ~ 10 km

(13) If a mountain range has a crust that is 60 km thick and a surface elevation of 4 km above

sea level, how much erosion is necessary to reduce the surface elevation to approximately one

kilometer above sea level? 2 points

(1) 5-6 km

(2) 10-12 km

(3) 15-18 km

(4) 20-24 km

(5) 25-30 km

(14) If 50 km thick crust having an average density of 3.0 g/cm3 has a surface elevation of 2.5

km above sea level, what would you predict about the surface elevation for 50 km thick crust

with an average density of 2.8 g/cm3 ? Assume the density of the underlying mantle is the same

in each case. 2 points

(a) surface elevation would be less than 2.5 km above sea level

(b) surface elevation would be higher than 2.5 km above sea level

(c) surface elevation would be 2.5 km above sea level

(d) there is not enough information given to make this prediction

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