You are presented with the question "What means changing from a solid into a liquid by adding heat from the sun?" and the following answer choices: 
- sunlight
 - sweating
 - freezing
 - rain
 - melting
 - softening
 - cooling
 - boiling

Now knowing that melting means changing from a solid into a liquid by adding heat energy and heat energy from the sun is stored in the earth, choose the best answer.


 

     melting    