An educated guess that attempts to explain an observation or answer a question. It is then tested with experiments, and if it makes falsifiable claims and is not disproven with a abundance of evidence, is called a theory. Thus, Gravity, Quantum Mechanics, Germ Theory, and Evolution are all referred to as theories.
- Wile, Dr. Jay L. Exploring Creation With General Science. Anderson: Apologia Educational Ministries, Inc. 2000