This seismic tomographic slice of Earth indicates the variations in S-wave speeds through the interior. Through which region will S waves move the fastest?
A) Pacific Ocean
B) Farallon plate
C) Mid-Atlantic Ridge
D) Africa
Answer: D
Environmental & Atmospheric Sciences
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A. Material ejected from a meteor crater B. A rotating cloud of cosmic dust and gas C. A very large solar flare D. A type of ancient volcanic eruption
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Species that are found in only one area and are especially vulnerable to extinction are referred to as which type of species?
A. specialist B. emergent C. generalist D. endangered E. endemic
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What geographic, political, and other factors have contributed to economic growth and stability in the United States and Canada?
Environmental & Atmospheric Sciences
Complete the following nuclear equation:
Bi ? 
Tl + ??
A. gamma ray
B. 
He
C. 
e
D. both A and B
E. none of the above
Environmental & Atmospheric Sciences