Rain which falls from a cloud but evaporates before reaching the ground is referred to as
a. sleet.
b. virga.
c. graupel.
d. dry rain.
e. drizzle.
Question 2What are the two main substances used in cloud seeding?
a. lead iodide and dry ice
b. silver iodide and lead iodide
c. ice crystals and flood powder
d. dry ice and sea salt
e. silver iodide and dry ice
Question 3Cloud seeding using silver iodide only works in
a. cold clouds composed entirely of ice crystals.
b. warm clouds composed entirely of water droplets.
c. cold clouds with a low ratio of ice crystals to water droplets.
d. clouds with more ice crystals than supercooled droplets.
e. clouds that can produce precipitation.
Question 4The growth of a precipitation particle by the collision of an ice crystal (or snowflake) with a supercooled liquid droplet is called
a. accretion.
b. spontaneous nucleation.
c. condensation.
d. deposition.
e. collision.
Question 5Contact freezing is
a. the freezing of supercooled droplets by contact with a nucleus.
b. the sticking together of ice crystals to make a snowflake.
c. the joining of many nuclei to form an ice nucleus.
d. the freezing of supercooled droplets when they come into contact with a supercooled surface.
e. the sticking together of any type of nucleus.
Question 6
For sub-freezing temperatures, the saturation vapor pressure just above a liquid water surface is ____ the saturation vapor pressure above an ice surface.
a. greater than
b. the same as
c. less than
d. 10 less than
e. 50 less than
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