In a thunderstorm, the upper part of the cloud usually contains _______, while the lower part usually contains _______.
a. Positively charged ice particles, negatively charged graupel.
b. Positively charged ice particles, positively charged graupel.
c. Negatively charged ice particles, negatively charged graupel.
d. Negatively charged ice particles, positively charged graupel.
Ans: a. Positively charged ice particles, negatively charged graupel.
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