Fact 1: Lack of moisture in the air causes low amounts of rainfall.

Fact 2: Rainfall is just one form of precipitation.

Given the two facts above, answer the question "A lack of moisture in the air causes low amounts of what?" with the following options: 
- harmful substances
 - Calcium carbonate
 - flooding
 - heat
 - desert
 - fossil fuels
 - nutrients
 - precipitation


 

        precipitation 