Fact 1: Absorbing energy causes objects to heat.

Fact 2: Students test the effect of a magnet on various metal objects.

Given the two facts above, answer the question "What causes metal to heat?" with the following options: 
- hydrogen and oxygen
 - electromagnetic energy
 - electricity
 - cooling nearby things
 - growth
 - absorbing energy
 - releasing energy
 - rays or beams


 

      absorbing energy   