Fact 1: Temperature falls from lower to higher altitudes.

Fact 2: Temperature Temperature is recorded in degrees Celcius.

Given the two facts above, answer the question "what falls from lower to higher altitudes?" with the following options: 
- gravity
 - degrees celcius
 - clouds
 - kinetic energy
 - density
 - colder and wetter
 - water vapor
 - heat energy


 

  degrees celcius       