Question

when does melting occur? when the temperature drops. when ice starts to freeze. when heat is increased.

Explanation:

Melting is a phase - change process where a solid turns into a liquid. It occurs when heat is added to a substance, increasing the kinetic energy of its molecules and causing them to break free from the solid - state lattice structure. When the temperature drops, freezing (opposite of melting) occurs, and when ice starts to freeze, it is going from a liquid to a solid state.

Answer:

When heat is increased.