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Earths Surface

New 'Model' May Explain How Continents Grow

LiveScience | Becky Oskin | Posted 03.24.2014 | Science

Continents grow like onions, with rings of younger rocks added layer by layer to the perimeter of an ancient landmass. But even though scientists kno...

Tipping Point

Donald L. Sparks | Posted 08.13.2012 | College
Donald L. Sparks

A group of 22 scientists sounded an alarming call to action last week. Their paper in the June 7 issue of Nature, carries the benign-sounding title, "Approaching a State Shift in Earth's Biosphere." But their conclusions are nothing short of a disaster warning.