University Corporation for Atmospheric Research
Ucar: The Water Cycle
This site provides a comprehensive introduction to the water cycle. Learners construct a model to simulate parts of the water cycle. Includes background information, links to standards, lesson plans, and assessment ideas.
National Earth Science Teachers Association
Windows to the Universe: Biogeochemical Cycles
Biogeochemical cycles happen when individual elements are recycled over and over in different parts of the Earth. Two examples are the Nitrogen Cycle and Carbon Cycle. Read an explanation of biogeochemical cycles and view a diagram of...
University Corporation for Atmospheric Research
Ucar: Introduction to Climate
A detailed overview of the Earth's climate, with explanations about the difference between weather and climate, dendrochronology, palynology, and how Earth's climate has changed over time. All information is reinforced through pictures,...
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.
Other
Few: Human Impact on the Environment & Environmental Impact on Humans
Human beings have an enormous impact on the natural environment, and ultimately on each other. The way we chose to house, clothe, shelter, and meet the needs for vital resources such as food, energy, and water, not only affect the...