In the Af climates,
a. only winter months receive more than 2.4 inches of precipitation.
b. only summer months receive more than 2.4 inches of precipitation.
c. all months receive more than 2.4 inches of precipitation.
d. total annual rainfall must exceed 71.6 inches.
Question 2
Sunspot numbers vary over a cycle roughly _______________ years long.
Fill in the blank(s) with correct word