CK-12 Foundation
Ck 12: Biology: Nitrogen Cycle
[Free Registration/Login may be required to access all resource tools.] Covers the nitrogen cycle.
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.
