How scientists can learn information about the past from fossils. [Free Registration/Login may be required to access all resource tools.]

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

[Free Registration/Login may be required to access all resource tools.] Looks at how environmental factors put limits on population sizes.

[Free Registration/Login may be required to access all resource tools.] Looks at how the overuse of groundwater can lead to problems.

[Free Registration/Login may be required to access all resource tools.] How Wegener's hypothesis of continental drift was refined.

[Free Registration/Login may be required to access all resource tools.] Describes how energy is transferred from one organism to another.

Covers divergent plate boundaries on land.[Free Registration/Login may be required to access all resource tools.]

[Free Registration/Login may be required to access all resource tools.] This is a basic introduction to the scientifice method that includes links to instructional videos, grade-level texts, interactive activities, and review materials.