Fact 1: Temperature falls from the equator to the poles.

Fact 2: Temperature is a measure of the amount of heat.

Given the two facts above, answer the question "What falls decreasingly on the earth from the equator to the poles?" with the following options: 
- autumn
 - heat
 - chill
 - Vapor
 - Energy
 - cold
 - summer
 - Mass


 

  heat       