An extraterrestrial impact (accumulating evidence suggests an asteroid or comet caused the Cretaceous extinction).
Alvarez
W
W
University of California, Berkeley, USA.
Asaro
F
F
D015258:Acid Rain; D000538:Aluminum Silicates / Q000032:analysis; D000818:Animals; D005075:Biological Evolution; D002119:Calcium Carbonate; D000077215:Clay; D003198:Computer Simulation; D004391:Dust; D018534:Earth, Planet; D005580:Fossils; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry; D017752:Greenhouse Effect; D007495:Iridium / Q000032:analysis* / Q000737:chemistry; D019110:Meteoroids; D018543:Minor Planets; D010163:Paleontology; D011791:Quartz; D018707:Volcanic Eruptions
D015258:Acid Rain; D000538:Aluminum Silicates; D004391:Dust; D011791:Quartz; D007495:Iridium; D002119:Calcium Carbonate; D000077215:Clay