You are presented with the question "What changes ice to water by adding heat energy?" and the following answer choices: 
- mussels
 - melting
 - freezing
 - fertilization
 - storms
 - boiling
 - engines
 - condensation

Now knowing that melting means changing from a solid into a liquid by adding heat energy and ice is the solid form of water, choose the best answer.


 

  melting       