Digital model of the skull of Leptarctus primus, showing reconstructed jaw muscle groups in red, yellow, and pink. The virtual muscles were activated in bite simulations to test the biomechanical capability of this extinct weasel relative.

Extinct weasel relative with confounding skull likely ate meat with a...

Layered lava flows within the Wai Subgroup from near Ambenali Ghat, Western Ghats.

Do volcanoes or an asteroid deserve blame for dinosaur extinction?

Basaltic dykes with a newly determined Age of 619 Million years in Novillo Gneiss, Tamaulipas (Mexico).

A volcanic binge and its frosty hangover

New species of tiny tyrannosaur foreshadows rise of T. rex

Adzebill skeleton

Origins of giant extinct New Zealand bird traced to Africa

Earth may be 140 years away from reaching carbon levels not...

Scientists excavate a dinosaur bone bed along the Colville River.

Marsupial lived among Arctic dinosaurs

Brimham Rocks

Brimham Rocks, England

Debris Flow Dynamics

Graphic showing the Transition Zone inside the Earth Princeton seismologist Jessica Irving worked with then-graduate student Wenbo Wu and another collaborator to determine the roughness at the top and bottom of the transition zone, a layer within the mantle, using scattered earthquake waves. They found that the top of the transition zone, a layer located 410 kilometers down, is mostly smooth, but the base of the transition zone, 660 km down, in some places is much rougher than the global surface average. “In other words, stronger topography than the Rocky Mountains or the Appalachians is present at the 660-km boundary,” said Wu. NOTE: This graphic is not to scale. Credit: Kyle McKernan, Office of Communications

Massive Bolivian earthquake reveals mountains 660 kilometers below our feet

1...153154155...686Page 154 of 686