University of Illinois Urbana Champaign: Trends Method in Mathematics

Explanation of why Antarctica has fossils of ferns, amphibians, and reptiles. Gondwanaland is discussed and shown in an interactive map.

Water is the source of life on earth. It exists in many forms and is constantly changing. The circulation and conservation of earth's water is called the hydrologic (or water) cycle. Find out how water evaporates, condensates,...

Excellent and comprehensive site created by the University of Illinois at Urbana-Champaign, Beckman Institute for Advanced Science and Technology. The site has resources about and links to information on a large number of topics in...

This site contains a couple different ways that one can forecast the weather. Methods include the Climatology Method, the Analog Method, and Numerical Weather Prediction.

This site examines the optics of the atmosphere and explains why we see different colored sunsets.

Explains what a pressure gradient is and how it produces air movement.

The Kelvin, Celsius and Fahrenheit temperature scales are discussed. Site lists and explains formulas for converting between the different scales.

Describes what relative humidity is, shows how it is calculated, and how it is related to evaporation and condensation.

This fact sheet shares numerous interesting facts about the common fruit, the apple. Great for the study of botany or biology. Available in English or Spanish.

A listing of all the known variety of apples with links to detailed information on and images of each variety. In both English and Spanish.