Answer:
The solid will start to transition from a solid to a liquid.
Explanation:
When a solid reaches the point of its melting point, the substance will start to turn into liquid form. As long as energy is constantly added, it will soon turn fully liquid. However, when it reaches it melting point, it will flip back and forth from solid to liquid form (solid to liquid equilibrium) until the energy added allows it to become fully liquid.
Take H2O for example. The melting point of solid water is 0°C. At that point, the solid ice starts to turn into water, but still is kinda solid and the ice shape is still there. When it is continuously heated (add energy), it will turn into liquid H2O.
