Which of the following factors helps magma rise toward Earth's surface?
A. pressure decreases with increasing depth
B. gas bubbles generally form at great depth and drive magma upward
C. magma is more dense and therefore tougher than the surrounding solid rocks
D. None of these choices are correct.
Answer: D
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A. plate tectonics B. ballast water transport C. shifts in climate patterns D. All of these choices are correct. E. None of these choices is correct.
Which of the following terms is a measure of the weight of the air above a location?
A) atmosphere B) aerosol C) pressure D) temperature E) meteorology
The average salinity of the world ocean is about ____
A) 52% B) 35% C) 21.5% D) 3.5%
Exfoliation (pressure-release jointing )is an examples of ________ weathering processes
A) only chemical B) only biological C) only physical D) both biological and physical E) both biological and chemical