Which of the following is CORRECT regarding Arctic sea ice?
A) Until recently, seasonal variations in sea ice extent were rare.
B) In the summer, most to all sea ice melts, only to refreeze in the winter. However, less water has been refreezing over the past decade.
C) Summer sea ice reached its minimum extent in 2001 and has gradually increased since then.
D) Since 1979, summer sea ice minimum extent and winter sea ice maximum extent have declined.
D
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P-waves refract at the boundary between inner and outer core because
A. there is a change of phase between inner and outer core. B. they lose speed. C. they gain speed. D. there is a change in chemical composition between inner and outer core.
Spreading centers at the Mid-Atlantic Ridge spread at a faster rate than those at the East Pacific Rise
a. True b. False
Cite three ways that rapid population growth presents organization problems for cities and urban areas.
What will be an ideal response?
This form of gerrymandering has been particularly attractive for creating districts inclined to elect ethnic minorities
A) stacked vote B) wasted vote C) excess vote D) gender biased E) anti-immigration biased