If you remove more thermal energy they will become a solid which is even more ordered. These changes in state are called phase transitions. Lot's of energy must be released or absorbed to pass through a phase transition. We noticed that time, motion and distance are all connected. We can measure time using uniform motion but we have trouble describing the uniform motion without first specifying our units of time.
Resonance is motion that repeats in a regular manner.
The simple pendulum and a mass on a string are examples of resonances. A resonance is about change. The motion is continuous cycling from rest to motion in one direction, then at rest and back to motion in the other direction. You will also see that the energy is continuously changing from kinetic to potential and back again. The nice thing about SHM is that the period of the motion is independent of the amplitude.