7,733 results
- Earth
Groundwater use adds CO2 to the air
Pumping out groundwater for crop irrigation or industrial purposes releases planet-warming carbon dioxide into the atmosphere.
- Paleontology
Rodents tell a geologic tale
The sudden appearance of many new species of rodents in Chile about 18 million years ago may have marked the rise of the southern Andes.
- Earth
Erosion accelerates along Alaskan coast
Alaska's northern coast is falling into the sea at an accelerating rate.
- Earth
Hued Afterglow: Fingerprinting diamonds via phosphorescence
The eerie phosphorescence displayed by a rare form of blue diamond can be used as an easy, cheap, and nondestructive way to identify individual gemstones and to distinguish natural blue diamonds from synthetic ones.
- Earth
Finding Fault: Trace of old subduction zone found in Italy
A thick layer of rocks now lying high in the mountains of Italy is the remains of a quake-generating subduction zone active under the sea millions of years ago, a discovery that provides clues about ancient seismic activity along this interface between tectonic plates and insights into what may be happening along many such subduction zones today.
- Humans
From the February 12, 1938, issue
Radio tower reaches for the sky, making a canyon the hard way, and forecasting the next big drought.
- Earth
Oxygen Rocks: Volcanoes spurred early atmospheric change
Earth owes its oxygen-rich atmosphere to a change in volcanic activity about 2.5 billion years ago.
-
19849
With respect to this article on kimberlites, diamonds, and mantle fractures, may I suggest that the fractures in question emanate from hypervelocity bolide impacts on Earth. There is ample spatial correlation between impact craters formed by oblique impacts with crustal-fracture systems that propagated outward along the direction of impact. Gregory C. HermanNew Jersey Geological SurveyTrenton, […]
- Humans
From the January 22, 1938, issue
Lightning striking again and again, estimating the age of the oceans, and dangerous, youthful drivers.
-
19847
In this article, the unusual head positions seem to indicate that these creatures died from a kind of nerve damage. One of the possibilities is oxygen deprivation. Doesn’t this suggest that most of these creatures probably died from suffocation after a sudden mud slide or other deluge? Ron McMurtryModesto, Calif. Suffocation from a mud slide, […]
-
Tadpole Slayer: Mystery epidemic imperils frogs
An emerging protozoal disease has begun to trigger mass die-offs of frog tadpoles throughout much of the United States.
- Environment
Down with Carbon
Scientists are exploring strategies for capturing carbon dioxide and storing it safely away in order to limit the levels of that greenhouse gas in the atmosphere.
