The correct answer to the question is option 2, Tremor. An earthquake is a natural occurrence that happens when there is sudden energy release in the Earth`s crust, resulting in shaking of the ground. This shaking is commonly referred to as a tremor. It is important to note that an earthquake is not a person (teacher) or a temperament (temper), but rather a geological phenomenon. Earthquakes can vary in size and intensity, and they can cause significant damage and loss of life. They are typically measured using seismographs, which record the vibrations caused by the movement of the Earth`s tectonic plates. Therefore, the correct term to describe an earthquake is a tremor.