CK-12 Foundation
Ck 12: Earth Science: Nitrogen Cycle in Ecosystems
[Free Registration/Login may be required to access all resource tools.] Describes the nitrogen cycle.
CK-12 Foundation
Ck 12: Earth Science: Nitrogen Cycle in Ecosystems
[Free Registration/Login may be required to access all resource tools.] Describes the nitrogen cycle.
Sophia Learning
Sophia: Plant Kingdom: Photosynthesis
An introduction to the nitrogen cycle as it relates to plant photosynthesis. Find out how plants obtain the nitrogen they need for life.