In the Arabian peninsula nation of Oman, geologists are studying the Hajar mountains–a range containing rocks that have been thrust up from the deep earth. Accessible to humans in only a few places on earth, these kinds of rocks offer clues to the planet’s deep history–and possible ways that natural processes may be harnessed to combat modern climate change.
The desert sultanate of Oman is home to some of the weirdest—and possibly most useful—rocks on earth. The stark Hajar mountains, near the border with Saudi Arabia, contain a chunk of earth’s mantle—a zone that makes up most of earth’s mass, but normally lies inaccessible to humans, far below the surface. Here, though, a sliver of mantle has made its way up to where we can see and touch it. The outcrop has drawn scientists looking for clues to the dynamics of the deep earth; the origins of life; and, most recently, ways to fight climate change.
A new study in the journal Nature provides fresh insight into deep-earth processes driving apart huge sections of the earth’s crust. This rifting mostly takes place on seabeds, but can be seen in a few places on land—nowhere more visibly than in the Afar region of northern Ethiopia.
A 500-foot-high sliver of the Palisades Cliff came crashing down May 12 at 7:28 p.m., jiggling our seismometer at the Lamont-Doherty Earth Observatory a few micrometers. Weighing about 10,000 tons, the rock smashed trees along the Hudson River and covered over a hiking trail, but fortunately caused no injuries.
A 500-foot rock face came crashing down from the Palisades cliffs along the Hudson River in Alpine, N.J. on Saturday night, shaking the ground for more than half a minute and dumping a fresh layer of boulders over a 100-yard strip of parkland below State Line Lookout. The shaking was strong enough to be registered by a seismic station a mile and a half away, at Columbia University’s Lamont-Doherty Earth Observatory, but no one was injured.