Oceanic crust is primarily ________
A) basalt
B) carbonate sedimentary rocks
C) clay minerals
D) granite
E) siltstone
A
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Carbon dioxide warms the troposphere, enhancing the planet's natural
A. greenhouse effect B. tipping point C. biogeochemical cycle D. carbon cycle E. net primary production
Which aquatic ecosystem has the highest net primary productivity?
A. open ocean B. rivers and streams C. hydrothermal vents D. continental shelf E. estuaries
What evidence did Alfred Wegener use to support his hypothesis of continental drift? What additional evidence was added later (post-World War II) that suggested seafloor spreading? How do these two ideas unite to form the theory of plate tectonics?
What will be an ideal response?
Vast, circular to elliptical dark-colored areas on the moon called maria represent ________
A) large volcanos B) large lowlands that were sea-beds when the moon had water C) very large impact craters filled with basaltic lava D) remnant highlands produced from a time when the moon was entirely molten