Scholastic
Study Jams! The Nitrogen Cycle
Expose your class to the steps of the nitrogen cycle with this short clip. Colorful computer imagery and animation explain how nitrogen travels from the atmosphere as a gas into plants and soil, where bacteria convert it into nitrates....
Amoeba Sisters
Carbon and Nitrogen Cycles
As the world turns ... so do the carbon and nitrogen cycles! Introduce them both to eager young biologists through an animated video, part of an extensive biology playlist. The narrator explains how each element moves through its...
Fuse School 
Nitrogen Cycle
In an atmosphere that contains so much unusable nitrogen, how do organisms get the nitrogen they need to survive? The narrated video discusses how atmospheric nitrogen is converted into the materials we need to build proteins in our...
Bozeman Science
Biogeochemical Cycling
A woman had a job crushing cans at the recycling plant; it was soda pressing. Video focuses on the ways our environment recycles, including the water cycle, carbon cycle, nitrogen cycle, and the phosphorus cycle. It also describes the...
It's About Time
The Nitrogen and Phosphorous Cycles
How do we affect the ecosystem, and what can we do to preserve it? Pupils explore chemicals that promote and inhibit plant growth, then discuss the importance of nitrogen and phosphorus to the survival of organisms and describe how...
Crash Course
Nitrogen and Phosphorus Cycles: Always Recycle! Part 2
We wish you a happy, healthy, and phosphorus school year! A video explains the importance of getting the nutrients that are needed and focuses on the nitrogen and phosphorus cycles. It includes discussions on the importance of...
Crash Course
The Hydrologic and Carbon Cycles: Always Recycle!
Introduce biogeochemical cycles and goes into detail about the hydrologic and carbon cycles. A scientific video engages learners and teaches them at the same time.
Deep Look
There's Something Very Fishy About These Trees ...
Around 80 percent of the nitrogen in plants living in coastal forests comes from decaying fish. Viewers learn how salmon encourage the growth of forests with a scientific video that highlights interdependence, ecosystems, and the...
Howard Hughes Medical Institute
Termite Activity Enhances Ecosystem Productivity and Stability
Termites in your house? Bad. Termites in your garden ... good? Discover the good side of an insect that often gets a bad rap with an interesting animation. The narrator discusses how termites break down plant material, what the soil...
Crash Course
Pollution
An environmental science video covers natural and synthetic compounds and the impact they have on the environment. It includes carbon, nitrogen, phosphorous, cyanide, mercury, sulfur, nitrogen dioxide, and endocrine disruptions. 
National Institute of Open Schooling
Air Pollution
Seventy percent of the air pollution in China is due to car exhaust. Under the umbrella of environmental chemistry, learners extensively explore air pollution. From the makeup of our atmosphere to sources of major air pollutants, classes...
Wilderness Classroom
Pollution
Educate scholars on pollution—air, water, and land—with a series of lessons that begin with a thorough explanation of each type. Learners then take part in three activities to reinforce the importance of reducing pollution. They...
Fuse School 
How Burning Fossil Fuels Leads to Climate Change
Do our vehicles really contribute to global warming? In part five of an eight-video series, pupils learn the mechanisms by which car emissions turn into greenhouse gases. Through animation, the class sees how the natural greenhouse...
Crash Course
Ecosystem Ecology: Links in the Chain
A video starts by defining an ecosystem. It expands on the concept by covering trophic structure, primary producers, primary consumers, secondary consumers, tertiary consumers, detrivores, and bioaccumulation. 
Encyclopedia of Earth
Encyclopedia of Earth: Biochemistry: Nitrogen Cycle
Article explaining what the nitrogen cycle is, and its role in an ecosystem. (Published: June 28, 2010)
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.
Nature Research
Nature: The Nitrogen Cycle: Processes, Players, and Human Impact
Find out how nitrogen is cycled throughout the biosphere as it passes through the nitrogen cycle. Learn about the biotic and abiotic factors involved in the process as well as the implications of human activity on the nitrogen 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.
CK-12 Foundation
Ck 12: Earth Science: Nitrogen Cycle in Ecosystems Study Guide
Review the main concepts of the nitrogen cycle in this study guide.
Khan Academy
Khan Academy: Ecology: The Nitrogen Cycle
Learn how nitrogen is recycled in our biosphere in the nitrogen cycle, including nitrogen fixation. [5:44]
Other
Algone: The Nitrogen Cycle
This resource gives a brief overview of the nitrogen cycle, dealing especially with the nitrogen cycle in aquariums.
University of Illinois
University of Illinois: Illinois State Water Survey: Nitrogen Cycle: Human Impact on the Nitrogen Cycle
An overview of the impact of human activities on the environment and how those actions effect the nitrogen cycle.
PBS
Pbs Learning Media: Crash Course Ecology: Nitrogen & Phosphorus Cycles: Always Recycle! Part 2
Hank describes the desperate need many organisms have for nutrients (specifically nitrogen and phosphorus) and how they go about getting them via the nitrogen and phosphorus cycles. [9:21]
Encyclopedia of Earth
Encyclopedia of Earth: Nitrogen
Information about the element, Nitrogen, atomic number 14. Covers common chemical transformations, its physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations. Also discusses...
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