This lesson introduces the viewer to the four Earth systems: atmosphere, lithosphere, hydrosphere, and biosphere.

The lesson explains how each system is made up of subcomponents and how each system interacts with the other three systems, all of which support life on Earth.

The carbon cycle and the water cycle are described and the life cycle is introduced.

This lesson is designed to satisfy the elements of the Texas Education Knowledge Standards for the World Geography course of study.

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