Question

a hurricane forms when a ______ gains strength over ocean waters.
a. occluded front
b. typhoon
c. tropical depression
d. polar storm

Explanation:

A tropical depression is a low - pressure system. When it gains strength over warm ocean waters, it can develop into a hurricane. An occluded front is a weather front, not a precursor to a hurricane. A typhoon is the same as a hurricane but in the Western Pacific. A polar storm occurs in polar regions and is different from a hurricane.

Answer:

C. tropical depression