You are presented with the question "What is required to melt something?" and the following answer choices: 
- Heat
 - Calories
 - liquid
 - copper
 - Joules
 - warmth
 - Kinetic energy
 - sugar

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


 

 Heat        