The world's most extensive regions of arid climate are ____.
a. centered on the Tropics of Cancer and Capricorn
b. centered on the equator
c. between 30o and 40o North and South latitude
d. centered on the poles
Question 2
________________ is a measure of the weight of water vapor (grams) in a particular volume of air (cubic meter).
Fill in the blank(s) with correct word