Landforms

landforms

Ocean tide size linked to supercontinent cycle

Daily tides are driven primarily by Earth’s rotation and the gravitational force of the moon on oceans. However, in a new study in Geophysical Research Letters, researchers suggest that tidal magnitudes are also influenced, on longer timescales, by the size and shape of the ocean basins, and are therefore driven by plate tectonics.

07 Sep 2018

No river meant no floods for ancient Indus settlements

Large Middle Eastern rivers like the Nile, Tigris, Euphrates and Tiber were critical for the development of early urban societies in Egypt, Mesopotamia and Ancient Rome. And researchers have long thought that the rise, and eventual decline, of cities in the ancient Indus Civilization, which spread across about 1 million square kilometers of what’s now northwestern India and Pakistan from roughly 4,600 to 3,900 years ago, also depended on major rivers, namely those emerging from the Himalayas. But a new study looking at river sediments from the time of the civilization and earlier suggests that wasn’t the case for every ancient Indus city; some may have benefited from being farther away from large rivers and their periodic floods.

23 Jan 2018

Megafloods mostly shaped Icelandic canyon landscape

A new study suggests that in one environment prone to catastrophic floods, the Jökulsárgljúfur Canyon in northeastern Iceland, the effects of several megafloods in the past 9,000 years have sculpted the canyon landscape far more so than “background” erosion caused by water and sediment flowing through it.

22 May 2015

Geoscience on Film: A parting ode to an awe-inspiring land

Doug Prose and his wife, Diane LaMacchia, have produced documentaries showcasing Earth and the geosciences through their nonprofit Earth Images Foundation since 1992. Currently at work on their next project, Prose is blogging for EARTH about the filmmaking process, as well as the work of the scientists they're covering, while on location in India.

10 Apr 2015

Geoscience on Film: Of tides and tigers in the world's largest river delta

Doug Prose and his wife, Diane LaMacchia, have produced documentaries showcasing Earth and the geosciences through their nonprofit Earth Images Foundation since 1992. Currently at work on their next project, Prose is blogging for EARTH about the filmmaking process, as well as the work of the scientists they're covering, while on location in India.

07 Apr 2015

Geoscience on Film: Traversing the contours and culture of an ancient delta

Doug Prose and his wife, Diane LaMacchia, have produced documentaries showcasing Earth and the geosciences through their nonprofit Earth Images Foundation since 1992. Currently at work on their next project, Prose is blogging for EARTH about the filmmaking process, as well as the work of the scientists they're covering, while on location in India.

01 Apr 2015

Geomedia: Books: Rediscovering the science behind Thoreau's 'Walden'

Last summer, I had the opportunity to enjoy a personal tour around the world’s most famous kettle pond, Walden Pond in Concord, Mass., led by geologist Robert Thorson, who recently authored the book “Walden’s Shore: Henry David Thoreau and Nineteenth-Century Science.” The rainy, gray day did not diminish our hike or Thorson’s delight in sharing what he had learned from his research into Henry David Thoreau’s lifelong fascination with Walden Pond and the science behind his iconic book, “Walden.”

19 Mar 2015

Gravity builds stone sculptures

Every visitor to Arches National Park in Utah wonders how the spectacular, seemingly improbable sandstone arches form, but although there are many hypotheses, testing different ideas in the field has proved all but impossible. Now a new modeling study suggests that while arches may seem to defy gravity, their formation actually depends on it.

11 Dec 2014

Humans causing California's mountains to grow

Humankind has proven time and again that it can reshape mountains, or even tear them down. Now, it appears, we can make them rise as well. Geologists studying growth rates of the Sierra Nevada and of central California’s Coast Ranges have identified an anthropogenic contribution to the mountains’ uplift that they suggest is tied to the decades-long depletion of groundwater in the state’s Central Valley. What’s more, the researchers report in a new study published in Nature, the long-term water loss may be affecting how stress builds up on faults like the San Andreas.

14 May 2014

Down to Earth With: Geomorphologist Gregory Tucker

As an undergraduate anthropology student, Gregory Tucker thought math was a boring subject with abstract rules that didn’t relate to his life. Today, that “boring” subject provides the foundation for Tucker’s innovative research involving numerical modeling and unique field studies that recently earned him the European Geosciences Union’s 2012 Ralph Alger Bagnold Medal, one of the highest prizes in geomorphology.

13 Jul 2012

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