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Grades 9-12

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Article: Zircons Recast Earth's Earliest Era

Rocks older than 4 billion years are not available to study, making the first 500 million years of Earth's history particularly mysterious. But cutting-edge techniques are now allowing geologists to study survivors of Earth's early era.

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Article: An Ode to O

Where would the world be without oxygen? While it's hard to imagine an Earth without it, for nearly the first half of the planet's 4.5-billion-year history, Earth had no oxygen gas as part of its atmosphere.

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Article: Earth Without Oxygen

Where would the world be without oxygen? While it's hard to imagine an Earth without it, for nearly the first half of the planet's 4.5-billion-year history, Earth had no oxygen gas as part of its atmosphere.

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Article: Life Makes a Mark

One of the biggest forces that's shaped planet Earth over time is microscopic in size. Explore the global impact of microbes.

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Biogeography Begets Biodiversity

Discover how the geological and climatic changes that have unfolded over millions of years in Vietnam have set the stage for an extraordinary richness of biodiversity.

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Biodiversity in the Crossfire

See how scientists are racing to reveal Vietnam's biological riches before many species and their habitats disappear from the country's landscape due to expanding development and human activity.

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Article: When Is "Wild" Actually "Feral"?

The takhi is the only true wild horse left in the world. The so-called "wild" horses that abound in Australia and North America are actually feral. Find out what it means when a domestic animal becomes feral. 

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Article: The Wild Horse Returns to Mongolia

Takhi horses became extinct in the wild in the late 1960s — but since 1997 they have been successfully breeding in the wild. Learn about the efforts behind this successful reintroduction. 

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Article: The Horse in Mongolian Culture

Take a look at Mongolia's takhi and discover how an Asian empire was won on horseback — and how Mongolia came to be known as the land of the horse. 

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