Taxonomy term

geology

Mineral Resource of the Month: Garnet

Garnet is the general name given to a group of complex silicate minerals, all with isometric crystal structure and similar properties and chemical composition. The most common garnet minerals are classified into three groups: the aluminum-garnet group, the chromium-garnet group and the iron-garnet group.

21 Feb 2019

Easter Island inhabitants drank brackish water to survive

The remote Chilean island of Rapa Nui, also known as Easter Island, is famous for its 961 giant stone statues and monuments, erected between 1200 and 1600. Called moai, these statues have been a mystery for years, especially considering just a few thousand people inhabited the small, resource-limited Pacific island nearly 3,700 kilometers west of Chile. “Why did people put the statues where they did?” asks Carl Lipo, an archaeologist at Binghamton University in New York. The answer, according to new research, may have something to do with the civilization’s water supply.

20 Feb 2019

Lab-grown magnesite a boon for carbon sequestration?

Left undisturbed, carbonate minerals can naturally lock up carbon in a stable form for millions of years or longer. Triggering the formation of carbonate minerals is thus a promising means of removing and sequestering carbon dioxide from the atmosphere. In recent research, scientists uncovered new details about how one of Earth’s most stable, albeit slow-to-form, carbonates — magnesite — grows in nature and have found a way to accelerate its formation in the lab at room temperature. The results could aid in developing efficient carbon sequestration technologies.

19 Feb 2019

Travels in Geology: Mid-ocean volcanic excursion: The calderas and caldeiras of the Azores

The Azores, a volcanic island chain spanning more than 600 kilometers, may be diminutive and difficult to find on the map, but the islands offer oversize opportunities for sightseeing and adventure that are sure to appeal to almost any traveler, particularly those with an eye for natural and geologic scenery.

18 Feb 2019

Humans accidentally created new rivers in Europe

Meandering rivers that flow through and transport sediment to deltas often split off from their main courses and flow in different directions. This process, called avulsion, happens naturally when a river overflows its banks and the floodwaters carve out a new course for the river to follow. But humans can also trigger avulsions by changing the shape of the landscape, and in a new study, scientists report that people have been doing this for a very long time.

15 Feb 2019

Geologic Column: Is this land really your land?

In 1940, Woody Guthrie wrote the iconic folk song, “This Land Is Your Land,” as a commentary on inequality. Where do we stand today, and who really owns the land in America?

13 Feb 2019

Archaeologists hit pay dirt in medieval latrines

Archaeologists digging in Lübeck, Germany, unearthed an unusual source of information about past dietary habits in the city: parasite eggs recovered from 700-year-old latrines.

12 Feb 2019

Sounding Out Earth's Hum

Scientists are working to isolate and identify the various sources and mechanisms, beyond earthquakes, that vibrate the solid earth. The search has led them offshore to investigate how wind and waves and the seafloor interact to produce a symphony of sound that humans can’t hear.

11 Feb 2019

Hot but not bothered: Warm soils favor microbes with small genomes

Centralia, Pa., sits above rich subterranean coal seams, which made the town a mining center for about a century. In 1962, the seams were accidentally ignited by burning garbage, turning the coal from a commodity into a liability. Driven away by fire-associated hazards and particulate air pollution, all but a few human residents have long since abandoned the town. However, a new study reveals that the same isn’t true for all forms of life: A diverse population of microbial life resides in Centralia’s hot soils. These heat-tolerant microbes are offering scientists novel insights into the composition and character of soil microbial communities and resilience in response to dramatic ecosystem change.

08 Feb 2019

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