What current is associated with upwelling?
a. countercurrents
b. eastern boundary currents
c. western boundary currents
d. warm-water currents
e. transverse currents
b
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When a parachute for a falling skydiver opens, speed is suddenly decreased. Acceleration of the diver during the opening
A. acts downward. B. acts upward. C. remains unchanged. D. none of these
Which bests describes the overall trend of average temperature changes from 1880-2010?
A. increasing B. decreasing C. no change D. insufficient data to know the trend
When an atom undergoes alpha or beta decay, it ____
A)becomes an ion of the same element B)becomes an isotope oh the same element C)becomes a completely different element D)may or may not become a completely different element E)becomes permanently stable
Which of the following is an economically important sedimentary rock?
A) pumice B) marble C) calcite D) coal