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In 1887, Ralph Abercromby and Hugo Hildebrandsson Expanded Howard's Original

Question 65

Multiple Choice

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

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