An important principle in one of the theories of the electrification of clouds is that
a. ?there is a net transfer of negative ions from a warmer object to a colder object.
b. ?supercooled water is always negatively charged.
c. ?ice crystals are always negatively charged.
d. ?there is a net transfer of positive ions from a warmer object to a colder object.
e. ?raindrops are always positively charged.
ANSWER: d
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