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Man's 7,000-Mile Wild America Trek Nears EndPreservationist has biked, paddled and walked far more than 500 miles.
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Images: Visit to an Inflating VolcanoThis mysterious peak may be a burgeoning supervolcano.
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Images: Scott's Lost PhotographsScott's photos reveal the explorer's artistic side, says author of a new book.
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Microbe Census to Delve Deep for Earth's 'Invisibles'Finding out what's down there is a big task, complicated by microorganisms' wily ways.
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Disaster's Aftermath: Assessing Hurricane Irene's DamageQuantifying the storm's ferocity is complicated, scientists say.
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Raining Meteorites May Have Led to Earth's Primordial LifeA hail of massive rocks from space could have sparked life on Earth.
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Rocks of Ages: An Amazing Journey into Earth & BackColorful rocks shed light on the Earth's tectonic past.
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Upside-Down Mountain Revealed Inside EarthNew images reveal surprisingly dramatic silhouettes lurk in Earth's interior.
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Leaf Forecast: Outlook Good for Colorful FallHurricane Irene may add kick to fall's colorful leaves.
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Earth's Final Frontier: Mysteries of the Deep SeaDark and deep for sure, but both lovely and unlovely discoveries await, scientists say.
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Volcanic Vents Give Sneak Peek of Acidic OceanScientists take a trip through time to peer into the future.
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For Sale: Pieces of Polar Explorers' Dramatic PastPhotos offer inside look at doomed polar expedition.
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Scott's Last Expedition: Images From His Doomed South Pole TrekScott's race to the Pole ended in tragedy, but these images show his team before they met their end.
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Three Storms Keep Hurricane Hunters BusyHunters flying into Katia, Maria and Nate.
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Why Japan's Typhoon Talas Was So DeadlyA huge storm brought record-breaking rains to an already beleaguered nation.
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Giant Chunk of Greenland Ice Set to Break AwayThis Greenland glacier produced a colossal ice berg last year, and may be set to do it again, this time with darker consequences.
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Surprise Coral Killer Hits Florida: Extreme ColdSaving reefs from weather extremes is possible if they're healthier overall, scientists say.
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Astronauts Eye Irene As It Heads AshoreAstronauts got another eyeful of the powerful hurricane.
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Inside Irene: What Hurricane Hunters Are FindingDespite slight weakening, no relief is in sight.
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Hurricane Irene 'Big, Scary Storm,' Astronaut SaysEven from space, Hurricane Irene's power is on full display.
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What Is Fueling Hurricane Irene's Fury?The hurricane has had ideal conditions in which to grow.
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Quest to Count Earth's Species Hits New NumberNoah would have needed a really big ark.
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Earthquake Rocks Virginia, DC, NY and Much of Eastern USShaking was felt up and down east coast.
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Seafloor Sensors Listen to Quake Zone RumblingsScientists take to sea to study a massive fault in the U.S.'s backyard.
