Freezing rain requires that:
a. the surface is colder than the air immediately above.
b. the surface is warmer than the air immediately above.
c. air temperatures must be above freezing at all altitudes.
d. air temperatures must be below freezing at all altitudes.
Question 2Snow insulates the ground well because:
a. the air between the individual snowflakes allows shortwave radiation to penetrate the snow and warm the ground.
b. the air between the individual snowflakes is a good insulator.
c. ice is a better insulator than air.
d. All of these choices.
Question 3Raindrops that reach the earth's surface seldom have diameters larger than:
a. 0.006 mm.
b. 0.6 mm.
c. 0.06 mm.
d. 6 mm.
Question 4Precipitation forms by the ice crystal process when:
a. clouds contain both ice crystals and liquid droplets.
b. the liquid droplets within a cloud are supercooled.
c. cloud temperatures are below freezing.
d. All of these choices.
Question 5The collision-coalescence process of precipitation formation is effective when:
a. cloud temperatures are above freezing.
b. cloud temperatures are below freezing.
c. clouds are composed exclusively of ice crystals.
d. None of these choices.
Question 6The diameter of a typical raindrop is about ________ than the diameter of a typical cloud drop.
a. 10 times larger
b. 10 times smaller
c. 100 times larger
d. 100 times smaller
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