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

Fact 2: Heat energy from the sun is stored in the earth.

Given the two facts above, answer the question "What means changing from a solid into a liquid by adding heat from the sun?" with the following options: 
- sunlight
 - sweating
 - freezing
 - rain
 - melting
 - softening
 - cooling
 - boiling


 

     melting    