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

Fact 2: Humidity is moisture in the air.

Given the two facts above, answer the question "lack of _  causes low amounts of rainfall" with the following options: 
- drought
 - humidity
 - heat
 - Dehydration
 - less water
 - flooding
 - oxygen
 - nitrogen


 

  humidity       