Taxonomy term

april 2016

Turtle finds lower Altiplano elevation estimate

Rare turtle fossils uncovered in Bolivia suggest that, about 13 million years ago, the southern portion of South America’s Altiplano — the arid, high-elevation plateau immediately west of the Andes — was far lower than previously thought.

29 Apr 2016

Geologic Column: May: Nature's forces in collision

Throughout history, May 1 has probably had more festivals and events associated with it than any other day of the year, from celebrations of spring and fertility to a day of protest for workers’ rights.

29 Apr 2016

Geomedia: Film: 'A Beautiful Planet' inspires with vivid views of life on and off Earth

An endless sea of bright dots surrounds you amid the otherwise darkened expanse as you slowly approach a swirling, recognizable cloud of glowing light — the Milky Way. As the galaxy grows to fill the screen, you feel as if you are heading home toward Earth. This sensation of being a crewmember on a spaceship stays with you throughout the new documentary film, “A Beautiful Planet,” as well as after it’s over — which is just what the filmmakers intended.

29 Apr 2016

Mercury levels support volcanic role in end-Cretaceous extinction

The end-Cretaceous extinction, known for finishing off the last dinosaurs about 66 million years ago, often evokes scenes of a large asteroid hurtling toward Earth. However, new evidence supports a growing consensus that the massive bolide wasn’t the only hazard that life on Earth had to contend with: A prolonged bout of major volcanic eruptions was also spewing climate-altering gases and other emissions such as mercury into the atmosphere.

28 Apr 2016

First all-digital geologic map of Alaska released

When it comes to natural beauty, Alaska’s rugged, massive landscape is an embarrassment of riches, with towering mountains and lush forests, countless islands and a seemingly endless coastline. Below the surface, it features a wealth of interesting geology and abundant resources. Now, policymakers, land managers, scientists and the public can all explore Alaska a little more deeply with the recent release of the first-ever fully digital geologic map of the entire state.

27 Apr 2016

Model targets better understanding of recurring Indian-Pacific storm systems

Scientists have known for decades that the Madden-Julian Oscillation (MJO) — a massive gathering of thunderstorms that forms intermittently over the Indian and western Pacific oceans — impacts regional and global weather. Predicting the impacts, however, has been more difficult because relatively little is known about the phenomenon, at least compared to El Niño and some other weather patterns. But in a new study, scientists have devised a mathematical model that clarifies how the MJO develops and progresses, which may pave the way for more accurate predictions of its effects.

26 Apr 2016

Magnesium part of Earth's magnetic field engine

Earth’s magnetic field, which arises from convective flows in the planet’s core, known as the geodynamo, has existed for at least 3.4 billion years, meaning that the field-generating processes must have existed for that long as well. But what exactly those processes have looked like throughout Earth’s history, particularly early on, has been poorly understood. In a new study, researchers suggest that magnesium mineral formation in the core is a previously unrecognized but important piece of the puzzle.

26 Apr 2016

Reading the ridges: Are climate and the seafloor connected?

New research suggests that midocean ridge volcanoes respond to variations in sea level, potentially leaving topographic records of past glaciations in the form of abyssal hills. But could those volcanoes also influence the climate cycles that drive sea-level changes?

25 Apr 2016

Humans evolved early to be more efficient sleepers

We humans spend about a third of our lives asleep. While that might sound like a lot, we require less sleep than most mammals. In a new study, researchers have quantified how much less sleep we need than other primates, and the findings may offer clues to how and when human sleep patterns evolved.

22 Apr 2016

Comment: GAVRT: Learning science by doing science

Students from kindergarten through high school have an opportunity to operate the Goldstone Apple Valley Radio Telescope, helping them learn science by participating in real scientific campaigns.

22 Apr 2016

Pages