In 1887, Ralph Abercromby and Hugo Hildebrandsson expanded Howard’s original cloud classification system and published a classification system that, with only slight modification, is still in use today. In their system, ____ principal cloud forms are divided into ____ primary cloud groups
a. ?eight; two
b. ?nine; three
c. ?ten; four
d. ?eleven; five
e. ?twelve; six
ANSWER: c
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