Taxonomy term

geology

From farm to filter: Restored wetlands remediate nitrogen pollution

The early 20th-century invention of a nitrogen-fixation process revolutionized agriculture and made it possible to feed the planet’s growing population. But nitrogen runoff is polluting our waterways and suffocating aquatic life. Now, researchers looking for ways to reverse that trend are turning farmland into wetlands to filter nitrogen from streams and rivers.
20 Apr 2018

Battery recycling underlies elevated lead in African soils

Of all the recycling industries in the world, lead-acid battery recycling is one of the most profitable — and one of the most toxic. In the U.S., regulations on the industry have dramatically reduced lead exposure and pollution at battery recycling plants. But in Africa, where the industry is growing and largely unregulated, lead levels are skyrocketing. A new study in Environmental Research looking at environmental lead levels in seven African countries is shining a spotlight on the ongoing public health crisis.

19 Apr 2018

Unprecedented exploration of undersea volcano yields surprising results

Underwater volcanic eruptions happen every day, but because of the vastness of the ocean and the great depth of water blocking the view, catching an active eruption is a game of chance. In fact, the largest-known underwater eruption of the past century was something of a fluke discovery. In July 2012, an airline passenger spotted a huge pumice raft floating in the South Pacific during a flight to Auckland, New Zealand. Upon landing, she alerted researchers, and scientists confirmed the 400-square-kilometer pumice raft near the Havre Seamount using NASA satellite imagery.

18 Apr 2018

World's longest underwater cave found in Mexico

In January, scientists and underwater explorers working with the Great Maya Aquifer (Gran Acuífero Maya, or GAM) project discovered the world’s longest flooded cave system, which stretches 347 kilometers in Quintana Roo on Mexico’s Yucatán Peninsula.

17 Apr 2018

Geomedia: Books: Solar eclipses past, present and future

The two books reviewed here — “Totality” and “American Eclipse: A Nation’s Epic Race to Catch the Shadow of the Moon and Win the Glory of the World” by Colorado science writer David Baron — both capture the historical scientific significance and the excitement that still exists today in viewing solar eclipses, particularly those that pass over our own piece of the planet.

16 Apr 2018

Geomedia: Television: "One Strange Rock" is Superlative

National Geographic's new 10-part documentary series, "One Strange Rock," is, in a word, superlative, according to our reviewer. Featuring gorgeous footage and state-of-the-art, digitally generated animations, and perhaps covering a wider range of earth science topics than other documentaries in the genre, it’s worthy of the adjective.

11 Apr 2018

Geologic Column: Over the hills and far away

English author G.K. Chesterton thought that “over the hills and far away” was the most poetic line in all of literature. The tune “Over the Hills and Far Away” mentioned in the nursery rhyme is a traditional British song from the late 17th or early 18th century. It was a siren’s song that promised wonder and adventure beyond the blue horizon. Gwyn Thomas, a fine though neglected Welsh writer, heard the song during his early-20th-century childhood in the Rhondda Valley, the heart of the south Wales coal region. Honeycombed by mines, the Rhondda’s spirit lay at the core of Thomas’ heart and imagination, and he distilled a mordant humor from the dark vibes of the life that he knew there.

10 Apr 2018

Getting there and getting around the Causses

Toulouse is the best gateway to the Causses region. Toulouse-Blagnac Airport hosts plenty of flights to connecting cities in Europe, but no direct flights from the United States. Rent a car at the airport and head north to explore the region. The main highway going north to the Causses is well maintained, with fueling stations along the way that offer everything a traveler might need, including showers. Figuring out how to pay for gasoline was tricky — but that’s part of the adventure of travel.

06 Apr 2018

Earth's "hum" heard at ocean bottom

Lapping waves or crashing surf may come to mind for most people when they imagine the sounds of the ocean. But the ocean has other voices as well, including one produced by interactions of waves with the seafloor along the continental slope. Unlike waves on the shoreline, this steady, low sound, or “hum,” is inaudible to the human ear and has even proven difficult to detect in recordings made by ocean bottom seismometers (OBS). But in a new study in Geophysical Research Letters, researchers analyzing OBS data have now clearly identified the hum for the first time, which may allow it to be used to develop a better picture of Earth’s interior structure.

04 Apr 2018

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