National Institute of Open Schooling
Environmental Concerns
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...
Smithsonian Institution
National Air and Space Museum: Exploring the Planets: Earth's Lithosphere
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.
University of Illinois
University of Illinois: Illinois State Water Survey: Nitrogen Cycle: Human Impact on the Nitrogen Cycle
An overview of the impact of human activities on the environment and how those actions effect the nitrogen cycle.
Center for Educational Technologies
Exploring the Environment: Earth System Science
Explains what the four spheres of the Earth are, and the interactions between them.
California State University
Csu: The Sourcebook for Teaching Science: Earth Systems Interactions
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.
eSchool Today
E School Today: Earth System
Learn about the systems that make up Earth, and find out how they interact.
Encyclopedia of Earth
Encyclopedia of Earth: Physical Geography
Get a general grasp on the four spheres, five sub-fields, and two scales of physical geography.