Here's why:

* States of matter: Liquids have molecules that are more spread out and move more freely than solids.

* Energy and movement: The molecules in a liquid have more kinetic energy (energy of motion) than molecules in a solid.

* Freezing: When a liquid freezes into a solid, the molecules slow down and become more tightly packed. This means they lose kinetic energy, and that energy is released as heat.

Example: When water freezes into ice, it releases heat into its surroundings, making the surrounding environment feel slightly warmer.