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Subtopic: Biogeochemical Cycles

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Resource	Grade Level	Media Type
Carbon Cycle Diagram This diagram from NASA Earth Science Enterprise illustrates Earth's carbon cycle.	6-12	JPEG Image
Cave Formation: Biogeochemical Cycles This video segment adapted from NOVA chronicles the discoveries that led to a radical new theory in which living organisms, not just geological processes, play an active role in cave formation.	6-12	QuickTime Video
Cave Formation: Kane Cave This video segment adapted from NOVA describes a simple experiment that confirmed the idea that microbes can accelerate the biogeochemical process of cave formation.	6-12	QuickTime Video
Caves: Extreme Conditions for Life This video segment adapted from NOVA raises the provocative idea that if life can exist in the most extreme environments on Earth — such as in dark, toxic caves — then perhaps living things can also survive in harsh environments on other planets.	6-12	QuickTime Video
Deep-Sea Vents and Life's Origins Deep-sea vents are home to life forms that do not rely on the Sun's energy. They depend instead on energy from volcanoes on the ocean floor. This video segment adapted from NOVA hypothesizes that life on Earth may have begun in this extreme environment.	3-12	QuickTime Video
Earth as a System This visualization adapted from NASA maps progressive global changes onto a rotating globe. Earth's atmosphere, hydrosphere, geosphere, and biosphere are shown to be dynamic and interconnected.	6-12	QuickTime Video
Global Trends Quiz In this interactive quiz from NOVA, take the Environmental Challenge and test your knowledge of human impact on the world's natural resources and climate.	3-12	Flash Interactive
Global View of the Seasons This interactive activity produced for Teachers' Domain features satellite data of Earth's seasonal cycles. Visualizations and comparative still images reveal how successfully plants are photosynthesizing at different times of the year.	6-12	Flash Interactive
Life Before Oxygen This video segment adapted from Interactive NOVA features evidence of life on Earth before the atmosphere contained a rich supply of oxygen.	3-12	QuickTime Video
Life's Little Essential: Liquid Water Why is water necessary for life? Why is it the best and possibly only liquid to do the job? This illustrated essay from NOVA Online answers these questions, explaining why planetary scientists are on the lookout for water elsewhere in the solar system.	6-12	HTML Document
The Mississippi River Delta These images from NASA, the Lunar and Planetary Institute, and U.S. Geological Survey illustrate the effects of severe storms and decades of river management on the size and shape of the Louisiana coastline and the Mississippi River Delta.	6-12	Flash Interactive
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.	9-12	Flash Interactive
Snapshot of US Energy Use This video segment adapted from NOVA/FRONTLINE looks at American energy consumption and the resulting production of greenhouse gases.	3-12	QuickTime Video
Soils Around the World Not all soils are the same. This interactive activity produced for Teachers' Domain features photographs of the 12 major soil types and maps that highlight their distribution around the world.	6-12	Flash Interactive
The Wall of Time This illustrated timeline from the Lunar and Planetary Institute provides a journey through four-and-a-half billion years of time from the birth of our solar system to its current existence today.	6-12	JPEG Image
What Killed the Dinosaurs? This Evolution Web feature uses animations to explore how evidence can support a variety of hypotheses surrounding the mystery behind the extinction of the dinosaurs.	3-12	Shockwave Interactive