Have you ever thrown a rock into a pond? There are ripples for quite a while after the rock splashes. But - eventually the pond’s surface will become still again.
The second Law of Thermal Dynamics is at work here. It states that things will move toward equilibrium. This is something called entropy — an equal state of balance.
Place a cube of ice in a pot of boiling water and see what happens . . . the ice cube and the pot of water will both change until they finally reach the temperature of the environment they are in. In fact, everything is moving toward the same temperature of the surrounding environment.