Contact 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.
ANSWER: a
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