title: Mass extinction. Has an impact done it again?
authors: Richard A
authors: RA
authors: Kerr
mesh_terms: D000818:Animals; D000864:Antarctic Regions; D025061:Dinosaurs; D037741:Fullerenes / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry*; D007495:Iridium / Q000032:analysis; D007501:Iron / Q000032:analysis; D008670:Metals / Q000032:analysis; D019110:Meteoroids; D008903:Minerals / Q000032:analysis*; D011156:Population Density; D013995:Time
chemical_list: D037741:Fullerenes; D008670:Metals; D008903:Minerals; D007495:Iridium; D007501:Iron