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. Given these facts, what is when solids are heated and ions move freely among the following options:
- dissolving
 - refreshing
 - kinetic energy
 - removing
 - boiling
 - barrel-shaped
 - renewing
 - unidirectional


 

 dissolving        