OpenStax
Open Stax: Requirements for Human Life
Earth and its atmosphere have provided us with air to breathe, water to drink, and food to eat, but these are not the only requirements for survival. Although you may rarely think about it, you also cannot live outside of a certain range...
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Plate Tectonics
Explore how plates move on the surface of the earth. Change temperature, composition, and thickness of plates. Discover how to create new mountains, volcanoes, or oceans! Java is required.