This comprehensive study guide covers the main terms and concepts needed for an earth science unit on the earth's layers. Review questions are included at the bottom of the study guide.

[Free Registration/Login may be required to access all resource tools.] Looks at how stratigraphy can be used to determine the relative ages of rocks, how unconformities occur, ways to match rock layers in different areas, and how...

[Free Registration/Login may be required to access all resource tools.] Identifies and describes the two internal layers of Earth.

This one-page explanation of the rock cycle contains a very helpful diagram and useful explanatory notes. Site explains how rocks are made and broken down.