Which of the following rock types requires dissolved gas in the magma?
A. pumice
B. granite
C. andesite
D. gabbro
E. diorite
Answer: A
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Which atmospheric gas is responsible for the largest percentage of the greenhouse effect?
The North Pacific is a common source region for ____________________ ____________________ air masses
Fill in the blank(s) with correct word
Until about 10,000 years ago, our ancestors lived by hunting and gathering or __________
Fill in the blank(s) with correct word
Which of the following best describes the effect of convective flow on the elevation of Earth's major landforms?
A) Convective flow adds more material to the base of the lithosphere, making it downwarp. B) Rotation of convecting mantle material smoothes out wrinkles in the surface. C) Hot rising material upwarps the landscape whereas downward flow causes downwarping. D) Subduction of oceanic plates disrupting the convective flow on the mantle, resulting in hot spots burning through the crust.