Weber State University
The Sun and the Seasons
Why is there more daylight in June than in December if you live above the equator? How does the angle of sunlight shift throughout the year? Answer these questions and more with an interactive article about the sun, its path through the...
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.
Center for Educational Technologies
Exploring the Environment: Earth System Science
Explains what the four spheres of the Earth are, and the interactions between them.
University of California
Ucmp: Creating an Earth System: Interactions in the Earth System
A brief description of the four spheres of the Earth, with an activity where students brainstorm interactions among them.
Rice University
Museums Teaching Planet Earth: What Is the Geosphere?
Describes Earth's layers, which make up the geosphere.
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.
Center for Educational Technologies
Wheeling Jesuit University: How Are Things Divided Among Earth's Four Spheres?
See if you can classify various objects in the categories of land, water, air or living thing. This activity is interactive and you will receive a score for your performance.