Every year, more than 14 billion pounds of garbage is dumped into the oceans of the world, most of which is plastic and toxic to ocean life. Lesson 32 in the series of 36 focuses on environmental concerns, specifically pollution. Under...

The plate tectonics and other features of the Earth's lithosphere are explained and illustrated. Has links to definitions of the magnetosphere, atmosphere, and hydrosphere.

Article explaining the importance of carbon as the basis for life, carbon dioxide's role in photosynthesis and respiration, carbon in the ocean and lithosphere, the impact of human activities on the carbon cycle, carbon that seems to be...

Explains what the four spheres of the Earth are, and the interactions between them.

An overview of the impact of human activities on the environment and how those actions effect the nitrogen cycle.

Explains what the four spheres of the Earth are and describes how volcanic eruptions affect the different spheres. Also provides a list of events that are examples of interactions.

Learn about the systems that make up Earth, and find out how they interact.

Plate Tectonics provides geology with a comprehensive theory that explains how the Earth works.

Get a general grasp on the four spheres, five sub-fields, and two scales of physical geography.