Earth today is one of the most active planets in the Solar
System, and was probably even more so during the early stages of
its life. Thanks to the plate tectonics that continue to shape
our planet's surface, remnants of crust from Earth's formative
years are rare, but not impossible to find. A paper published in
Nature Sept. 2 examines how some ancient rocks have resisted
being recycled into Earth's convecting interior... - Water in
Earth's mantle key to survival of oldest continentsThu, 2 Sep
2010, 13:37:34 EDT - What goes down, must come up: Earth's leaky
mantleWed, 27 May 2009, 13:45:07 EDT - McGill researchers find
oldest rocks on EarthThu, 25 Sep 2008, 14:36:48 EDT - Building
blocks of early Earth survived collision that created moonMon,
20 Feb 2012, 7:33:15 EST - Scientists publish first ever
evidence of asteroids with earth-like crustWed, 7 Jan 2009,
14:09:59 EST