The sun is our primary source. Earthquakes are energy released. Both atomic and chemical compounding result in energy activities. Energy moves the earth's crust and drives food chains. The earth has volcanoes, earthquakes, and uplifting.
Bacteria change frequently, so that drugs are no longer effective.
The dinosaurs no longer exist. However, the eohippus is now the horse. Changes are now known to have happened both over long periods and virtually instantaneously in both biological and geological terms. In the early grades, certain non-evolutionary changes are used to prepare the student for later, in depth work. Earth and animals change overtime.