If a rock containing andalusite and sillimanite were to undergo an increase in pressure, what must happen to temperature in order for that rock to continue to have stable andalusite and sillimanite?
A) temperature must increase
B) temperature must decrease
C) temperature must stay the same
D) It is impossible for it to continue to have stable andalusite and sillimanite.
Answer: B
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What does the deep red color in this soil profile suggest?
A) Magnesium is present because the area was recently submerged beneath a shallow sea
B) Glaciers have scoured the landscape
C) Iron-bearing minerals have been leached downward
D) The soils are water logged most of the time
E) There is an extreme amount of organic material throughout the profile
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