You are adding heat/energy.
It is melting.
If we take solid, liquid and gas being the three main states of matter (plasma being an arguable fourth), then from solid to liquid, the process melting occurs, from liquid to gas evaporation or boiling (they are different things) occur. Then from gas to liquid condensation occurs and from liquid to solid freezing occurs.
The process in which a solid changes to a liquid is called melting.
Liquid to gas, solid to liquid, and liquid to solid
The type of matter that changes its form is called a phase change. This occurs when a substance transitions between different states of matter, such as solid to liquid, liquid to gas, or gas to solid, due to changes in temperature or pressure.
There are several names for when a solid changes to a liquid. Usually, melting of a solid occurs when heat is used near the solid and it changes it to a liquid.
Freezing.
This change in the state of matter (liquid to solid) is called freezing, not melting; it is a physical change, the chemical nature of the molecules is not changed.
solid to a liquid
What type of change occurs when water changes from a solid to a liquid
The phase changes of matter are melting (solid to liquid), freezing (liquid to solid), vaporization (liquid to gas), condensation (gas to liquid), sublimation (solid to gas), and deposition (gas to solid). These transitions occur due to changes in temperature and pressure.
The process is called a phase change or a change of state. This occurs when matter transitions from one physical state, such as solid, liquid, or gas, to another state due to changes in temperature or pressure.
Freezing occurs.