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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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Why Mangroves Matter

Learn more about these forests, once generally dismissed as swampy wastelands but now valued as remarkably diverse and important ecosystems.

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What's a Mangrove? And How Does It Work?

Investigate this remarkably tough plant that can live in water up to 100 times saltier than most other plants can tolerate, not to mention thrive despite twice-daily flooding by ocean tides.

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Mangrove Threats and Solutions

Straddling land and sea and teeming with life, mangrove forests are key to healthy coastal ecosystems. They're also among the most threatened habitats in the world. Learn more.

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Ghosts of Tsunamis Past

By unearthing sediment deposits tsunamis leave behind, scientists can study the waves' origins, extent, and frequency — and identify locations that have the geological apparatus to produce a tsunami, but haven't in written history.

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From Math to Maps

A tsunami hasn't affected the Pacific Northwest coast since 1964, yet bright-blue metal signs warning of them dot coastal streets. Find out why scientists are certain these communities are at risk.

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