Taxonomy term

geology

European mammals will struggle under climate change

As temperatures on Earth rise, many animals have already begun migrating to more amenable climates, shifting their ranges. But not all animals will be able to relocate, according to a new study in the journal Diversity and Distributions.

20 Aug 2018

New suspect emerges in theft of Earth's surface iron

Iron is the fourth-most common element in Earth’s crust, but why there isn’t more found near the surface in continental crust has been a long-standing question among geologists. In a new study, scientists implicate an overlooked mineral culprit in the theft of iron from continental crust: garnet. But not everybody is ready to exonerate the long-implicated magnetite.

17 Aug 2018

Getting There and Getting Around Cairo

Egypt’s main gateway is Cairo International Airport (CAI), which has nonstop flights to most major Middle Eastern and European cities. EgyptAir offers direct flights to Cairo from New York City and Toronto. From other North American locations, it’s usually most convenient to fly through Dubai, Abu Dhabi or a European hub. British Airways, Emirates, Etihad, Lufthansa and Turkish Airlines are among the carriers offering connecting service.

16 Aug 2018

Travels in Geology: The pyramids of Giza: Wonders of an ancient world

At the edge of Cairo, three massive pyramids rise from the Giza Plateau’s Mokattam Formation, which comprises of layers of middle Eocene limestones and dolomites. These rocks, which display fossil evidence of their origins at the bottom of the Tethys Sea some 50 million years ago, provided the millions of multiton blocks used to construct the pyramids.
16 Aug 2018

Bolts of insight on earthly gamma ray showers

A handful of times between 2014 and 2016, an array of ground detectors placed in Utah’s western desert sensed something in thunderstorms that occasionally raged overhead: showers of gamma rays — the highest energy waves in the electromagnetic spectrum — occurring alongside lightning bolts.

15 Aug 2018

Down to Earth With: Volcanologist Scott Rowland

When Scott Rowland returned to his home on Oahu after earning a bachelor’s degree in geology at Oregon State University, intent on heading to graduate school, he was torn between studying volcanoes or groundwater. Ultimately, he chose to study Hawaii’s basalt lavas as a graduate student at the University of Hawaii at Manoa.

14 Aug 2018

Mineral Resource of the Month: Tin

The main source of tin is cassiterite (SnO2), a tin oxide mineral; cassiterite has been the primary source of tin throughout history. Most of the world’s identified tin resources occur as placer deposits, a large number of which are located along the Southeast Asian tin belt. The remaining resources occur as hydrothermal hard-rock veins. In the United States, tin deposits are rare; there are no known extensive tin placer deposits and the few hard-rock deposits are currently not economically exploitable.

12 Aug 2018

Searching for the volcanic origins of iron ore

Most iron ore comes from sedimentary deposits. However, a sizeable minority is mined from volcanic rocks, including those found along the Coastal Cordillera of northern Chile, and in Kiruna, Sweden.

09 Aug 2018

Seismic waves are blind to water

Geoscientists use the seismic waves produced by earthquakes to image the internal structure of the planet. Some seismic waves travel through liquids, while others do not, which is how we know, for instance, that Earth has a solid inner core and a liquid outer core.

08 Aug 2018

A rocky source of nitrogen

Calculations of the planet’s nitrogen balance have always been off: plants and soils seem to sequester far more nitrogen than expected. The atmosphere has long been thought of as the only major source of nitrogen, but a new study indicates an additional source: as much as a quarter of Earth’s terrestrial nitrogen may be supplied by eroding bedrock.

07 Aug 2018

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