Fact 1: Melting means changing from a solid into a liquid by adding heat energy.

Fact 2: Ice is the solid form of water.

Given the two facts above, answer the question "What changes ice to water by adding heat energy?" with the following options: 
- mussels
 - melting
 - freezing
 - fertilization
 - storms
 - boiling
 - engines
 - condensation


 

  melting       