You are presented with the question "What is when solids are heated and ions move freely?" and the following answer choices: 
- dissolving
 - refreshing
 - kinetic energy
 - removing
 - boiling
 - barrel-shaped
 - renewing
 - unidirectional

Now knowing that melting is when solids are heated above their melting point and when melted or dissolved in water, the crystal lattice is destroyed and the ions move freely, choose the best answer.


 

 dissolving        