06 October 2014, 07:34 AM ET
A run-of-the-mill volcanic eruption from Alaska's Mount Churchill spread ash from Canada to Germany 1,200 years ago.
02 October 2014, 02:17 PM ET
Earth's atmosphere wasn't always full of life-giving oxygen — it was once a choking mixture of carbon dioxide and other gases, more like the atmosphere of Mars or Venus.
02 October 2014, 02:00 PM ET
Scientists have created some of the most vivid maps yet of the deepest and most mysterious spots beneath the ocean, revealing spreading ridges and undersea mountains once veiled by sediments and ocean waters.
02 October 2014, 02:00 PM ET
A new gravity map of Earth's seafloor fills in blanks and will reveal its geologic history in greater detail.
02 October 2014, 10:47 AM ET
The moon's Ocean of Storms was previously thought to be a round crater left after a giant impact, but now researchers surprisingly find it is underlain by a giant rectangle created by cooling lunar lava as the moon formed.
02 October 2014, 07:41 AM ET
Evolution is often said to be "blind," because there's no outside force guiding natural selection. But changes in genetic material that occur at the molecular level are not entirely random, a new study suggests.
02 October 2014, 07:30 AM ET
In a series of arrests from August to September, police caught four people peddling the gills, snouts and other parts of rays, among other grisly animal products.
01 October 2014, 03:52 PM ET
Another Arctic milestone was reached this week when a cargo ship fortified against ice completed a solo trip through the hazardous Northwest Passage.
01 October 2014, 01:16 PM ET
Ice-penetrating radar has uncovered a previously unknown ice-covered trench, and other detailed terrain, in the bedrock hidden beneath two massive, bluish glaciers in Greenland and Antarctica.
01 October 2014, 01:00 PM ET
It's time to stop trying to keep global temperatures below 2 degrees Celsius above preindustrial averages, researchers argue. But not everyone is so quick to dismiss this prominent international goal.
01 October 2014, 12:26 PM ET
So much ice has disappeared from West Antarctica that Earth's gravity is weaker.
01 October 2014, 09:35 AM ET
In September, when Hurricane Edouard was churning out over the Atlantic Ocean, NASA dispatched its Global Hawk drones to fly directly over the eye of the storm.
01 October 2014, 08:43 AM ET
Areas contaminated with anthrax lure grazing animals like zebras, which could lead to new rounds of infections. Anthrax-infected carcasses might release more nutrients into the soil than other carcasses, making the sites attractive to grazers.
30 September 2014, 05:01 PM ET
The number of mammals, birds, reptiles, amphibians and fish on Earth dropped by 52 percent from 1970 to 2010, according to the World Wildlife Fund's newly released Living Planet Report.
30 September 2014, 03:35 PM ET
NASA's Global Hawk drone soared above the eye of Hurricane Eduoard over the Atlantic Ocean in September 2014.
30 September 2014, 03:29 PM ET
Fluctuations in gravity can be attributed to the loss of ice in West Antarctica according to data from ESA's GOCE satellite.
30 September 2014, 12:00 PM ET
While volcanoes may not have “seasons” as we know them, scientists have started to discern intriguing patterns in their activity.
30 September 2014, 11:15 AM ET
Pictures from space show that fall is in full swing in parts of North America. Clusters of trees have shed their summer greens in favor of autumnal oranges and reds around the Great Lakes and New England.
29 September 2014, 06:14 PM ET
Man-made climate change stoked some of 2013's most extreme heat on the planet, a new report shows.
29 September 2014, 05:14 PM ET
New and surprising facts from a recent count of Earth's lakes.
29 September 2014, 05:09 PM ET
With high-resolution satellite data and supercomputers to check every cloudless pixel, researchers now have the best count yet of lakes on Earth.
29 September 2014, 04:20 PM ET
Japan's deadly blast at Mount Ontake was likely a phreatic eruption, a steam explosion that is nearly impossible to predict.
29 September 2014, 04:00 PM ET
NASA's Earth Observatory released an image of an 'O'-shaped open-cell cloud that formed over the Pacific Ocean in early September.
29 September 2014, 02:00 PM ET
Sophisticated oceangoing canoes and favorable winds may have helped early human settlers colonize New Zealand, a pair of new studies shows.
29 September 2014, 10:06 AM ET
Rescue crews finished recovering the remaining 27 bodies from atop Japan's Mount Ontake Monday. At least 31 people were killed Saturday in the mountain's first fatal volcanic event in modern history.
29 September 2014, 07:54 AM ET
A high-speed camera run by the University of Florida's Lightning Research Laboratory caught an unusual bolt from the blue in Gainesville.
27 September 2014, 10:22 AM ET
A plasma bubble likely contributed to the helicopter radio communication failure during the battle of Takur Ghar, part of Operation Anaconda during the war in Afghanistan.
26 September 2014, 05:05 PM ET
How to prepare for a hurricane, from supplies to emergency evacuation plans.
26 September 2014, 04:22 PM ET
Geologists are using 3D-printed rocks to study how oil and gas moves through underground rock and the research could have important implications for fracking.
26 September 2014, 02:22 PM ET
An ancient, catastrophic flood or earthquake may explain how a bewildering rock formation in Colorado's Rocky Mountains formed, a new study finds.
26 September 2014, 01:46 PM ET
Once a sprawling oasis in the mostly arid Central Asian countries of Kazakhstan and Uzbekistan, the Aral Sea is now a fraction of its former self. Images captured by a NASA satellite show that the eastern basin of the South Aral Sea is now completely dry.
26 September 2014, 08:53 AM ET
The Arctic's shrinking sea ice is reshaping the region's food web from the bottom up, a new study reports.