Vision Learning
Visionlearning: Earth Science: The Nitrogen Cycle: Of Microbes and Men
Instructional module focusing on the nitrogen cycle. Discussion includes the requirement of nitrogen by all organisms, the five processes in the nitrogen cycle, and how humans impact this cycle. The site also includes an interactive...
CK-12 Foundation
Ck 12: Biology: Nitrogen Cycle
[Free Registration/Login may be required to access all resource tools.] Covers the nitrogen cycle.
University of Missouri
Nitrogen in the Environment: The Nitrogen Cycle
A description of the key concepts and steps within the nitrogen cycle, along with a large chart illustrating the cycle in pictorial form.
Georgia Department of Education
Ga Virtual Learning: Matter and Energy Cycles
In this incredibly comprehensive interactive tutorial you will learn about the carbon cycle. You will also learn about how matter and energy flows through the nitrogen cycle and phosphorus cycle.
BiologyWise
Biology Wise: Nitrogen Cycle Steps
Nitrogen is essential to all living things. This article explains what the nitrogen cycle is and the five steps involved in it.
Biology Pages
Kimball's Biology Pages: The Nitrogen Cycle
An overview of the nitrogen cycle, covering nitrogen fixation, decay, nitrification, denitrification, and more.
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: Life Science: 12.23 Nitrogen Cycle
Learn about the Nitrogen cycle, and understand how it affects the ecosystem.
BiologyWise
Biology Wise: Understanding Nitrogen Cycle With a Diagram
Describes the steps involved in the nitrogen cycle, a critical biogeochemical cycle.