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 "What causes low amounts of precipitation?" with the following options: 
- Plant growth is reduced
 - a hemisphere is tilted away from the sun
 - more condensation
 - extra moisture in the air
 - excess water supply
 - fissures of hot, acidic water
 - lack of moisture in the air
 - a tree falling


 

       lack of moisture in the air  