The melting of a solid is process because heat energy is the melting of a solid is process because heat energy is endothermic/released endothermic/absorbed exothermic/absorbed exothermic/released

Option (b) is the correct answer.

Explanation:

A chemical process in which there will be absorption of heat by the reactant molecules is known as an endothermic reaction.

For example,

When a solid melts then actually heat energy is absorbed by it due to which bond between its molecules break. As a result, molecules start to move from their initial position as kinetic energy is gained by them.

As a result, solid state of substance changes into liquid state.

On the other hand, a chemical reaction in which there occurs release of heat is known as an exothermic reaction.

For example,

Therefore, we can conclude that the melting of a solid is an endothermic process because heat energy is absorbed.

petroleum? coal maybe?

answer; protein;