The following glossary includes terms that are used in Student Text, Epoch Seven in our Evolving Universe.

Kinetic energy
Kinetic energy is the energy that a body possesses as consequence of its motion.

Plasma
Plasma is sometimes called the fourth state of matter. It is gaseous and contains high-energy electrically-charged particles, like free electrons and positively- and negatively-charged ions. The following glossary includes terms that are used in Student Text, Epoch Seven in our Evolving Universe.