title: Life: asteroid target, witness from the early Earth, and ubiquitous effect on global geology.
authors.affiliation: Department of Geophysics, Stanford University, Stanford, California 94305, USA. norm@stanford.edu
authors.forename: Norman H
authors.initials: NH
authors.lastname: Sleep
mesh_terms: D018534:Earth, Planet; D019418:Evolution, Chemical; D055593:Geological Phenomena; D006801:Humans; D018543:Minor Planets