Asteroid impacts significantly altered ancient Earth
Arizona State University, Science Daily, July 31, 2014.http://www.sciencedaily.com/releases/2014/07/140731150045.htm
Marchi, S., W. F. Bottke, L. T. Elkins-Tanton, M.
Bierhaus, K. Wuennemann, A. Morbidelli, D. A.
Kring, 2014, Widespread mixing and burial of
Earth’s Hadean crust by asteroid impacts.
Nature. vol. 511, no.7511, pp. 578-582.
http://www.nature.com/nature/journal/v511/n7511/full/nature13539.html
Yours,
Paul H.
