Answer
Fusion is an endothermic reaction because the solid gains heat while the surroundings cool down. Freezing is an exothermic process because the liquid loses heat while the surroundings heat up.
Work Step by Step
Fusion is an endothermic reaction because the solid gains heat while the surroundings cool down. Freezing is an exothermic process because the liquid loses heat while the surroundings heat up.
