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biosphere
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Earth's environmental spheres Earth's known living species ecosystem energy transfer energy flow nitrogen cycle nitrogen fixation energy exchange
The video thumbnail shows a small squirrel peeking out of a snowy bank, with a blue circle surrounding it.
osmotic regulation terrestrial hot spots of biodiversity
For Students
biosphere summary
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Model of global ocean currents and temperatures
How Do Ocean Currents Affect the Biosphere?
A large school of mano (sharks) called Galapagos sharks at Maro Reef in the Papahanaumokuakea Marine National Monument. Galapagos shark (Carcharhinus galapagensis)a worldwide species of requiem shark, family Carcharhinidae.
Saving Sharks in the 2020s
Community service - volunteers picking up garbage in a park during a spring cleanup. Environmentalism
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Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)
Falling Stars: 10 of the Most Famous Endangered Species
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12 Novels Considered the “Greatest Book Ever Written”
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Germans from East and West stand on the Berlin Wall in front of the Brandenburg Gate in the November 10, 1989, photo, one day after the wall opened.
Timeline of the 1980s
Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
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Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar
Ten Days That Vanished: The Switch to the Gregorian Calendar
Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
What Is the Emoluments Clause?

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Photos and Videos

Earth's environmental spheres
Earth's known living species
ecosystem energy transfer
energy flow
nitrogen cycle
nitrogen fixation
energy exchange
osmotic regulation
terrestrial hot spots of biodiversity
The video thumbnail shows a small squirrel peeking out of a snowy bank, with a blue circle surrounding it.
How greenhouse gases affect Earth's climate
The importance of nitrogen and phosphorus in ecosystems
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