decreases over a period of time and is lost. increases and the particles move apart. causes the particles to move closer together. is converted into potential energy.
I gave my students this multiple choice question: An ice cube melts on a hot summer day because the energy of the particles

Only one answer is correct among these 4 choices:
- decreases over a period of time and is lost.
- increases and the particles move apart.
- causes the particles to move closer together.
- is converted into potential energy.

Could you tell me which one is correct?

increases and the particles move apart.