During the summer, what conditions prevail near the surface over the Great Plains that help a hailstone survive as ice all the way to the ground?
a. strong updrafts
b. weak updraftsdry air
c. dry air
d. a rapid change in pressure
e. a rapid change in temperature
ANSWER: a
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What types of rocks would be most common in the small volcano in this photograph?
A) Scoria and other vesicular basalt
B) Basalt mostly formed in lava flows
C) Felsic and intermediate lava flows
D) Welded tuff and tephra
E) None of these are correct.
Over the last three decades in the United States,
A) soil erosion has steadily increased while wind erosion has steadily decreased. B) estimates and actual measurements indicate that soil erosion has decreased. C) the increased reliance on plowing and technology has increased soil and wind erosion. D) measurements of the amount of soil in major rivers indicate great increases in soil erosion.
Tiny solids or liquids suspended in the atmosphere— including dust and pollutants— are called ____
a. lapses b. aerosols c. isotherms d. tropopauses e. ionospheres
Most earthquakes at divergent plate boundaries are
A. shallow focus B. deep focus C. intermediate focus D. all of the preceding