Heat Energy - Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gasses. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.

Radioactive decay - Radioactive decay is the emission of energy in the form of ionizing radiation. Ionizing radiation can affect the atoms in living things.

Tectonics - Tectonics is the study of the processes that deform Earth’s crust. It is based on the Greek word tekton which means “builder.”