8.E.5A All Earth processes are the result of energy flowing and matter cycling within and among Earths systems. Because Earths processes are dynamic and interactive in nature, the surface of Earth is constantly changing. Earths hot interior is a main source of energy that drives the cycling and moving of materials. Plate tectonics is the unifying theory that explains the past and current crustal movements at the Earths surface. This theory provides a framework for understanding geological history.
Middle School (6-8)