The deep-ocean trenches are usually associated with ________.
A. volcanism
B. earthquakes
C. island arc systems
D. All of these are correct.
E. None of these is correct.
Answer: D
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Answer the following statement true (T) or false (F)
How might hydrothermal ore genesis occur?
A) Hot seawater rushes through porous rocks and crystallizes on contact with the rocks. B) Cold seawater meets hot circulating hydrothermal fluids and precipitation occurs. C) Two rock masses meet at a hydrothermal vent and the heat of the water dissolves ions from both masses. They recrystallize when they are carried to cooler water. D) Hot water from a hydrothermal vent dissolves ions from one rock mass and reprecipitates them as ore in cooler water.
Despite having almost 200 million people, Brazil does not have much land
Indicate whether the statement is true or false
The "redshift" of a galaxy refers to the rate
A. at which is receding. B. of its fusion. C. at which it is approaching. D. at which it is spinning.