Utah Education Network
Uen: Themepark: Cycles
This is a large collection of resources on cycles of nature and the Earth. There is a constant exchange of the elements between air, earth, water, plants, and animals. Most biological processes wind up back where they started. These...
PBS
Pbs Learning Media: The Nitrogen Cycle
Nitrogen, one of the most abundant elements in the universe, is essential to life. This interactive activity adapted from the University of Alberta provides an overview of the nitrogen cycle. Includes background reading handout and...
Biology Pages
Kimball's Biology Pages: The Nitrogen Cycle
An overview of the nitrogen cycle, covering nitrogen fixation, decay, nitrification, denitrification, and more.
BiologyWise
Biology Wise: Information About Nitrifying and Denitrifying Bacteria
Learn about the important role that nitrifying and denitrifying bacteria play in the nitrogen cycle.
University of Illinois
University of Illinois: Illinois State Water Survey: Simplified Nitrogen Cycle
A semi-technical description of the nitrogen cycle. Contains a link to an abridged version of the page along with a list of further resources on the topic.
CK-12 Foundation
Ck 12: Earth Science: Carbon Cycle and Climate
[Free Registration/Login may be required to access all resource tools.] Explains the cycle of carbon through the atmosphere, geosphere, and biosphere.
BiologyWise
Biology Wise: Carbon Cycle Diagram
Explains what the carbon cycle is and the basic steps in the cycle.
BiologyWise
Biology Wise: Carbon Oxygen Cycle
The fours stages of the carbon-oxygen cycle are described - photosynthesis, respiration, combustion, and decomposition.
BiologyWise
Biology Wise: Understanding Nitrogen Cycle With a Diagram
Describes the steps involved in the nitrogen cycle, a critical biogeochemical cycle.