RESOURCES: Tallying Earth's Scars

Science  30 May 2003:
Vol. 300, Issue 5624, pp. 1349
DOI: 10.1126/science.300.5624.1349a

Although Earth doesn't share the moon's pockmarked complexion, plenty of asteroids, meteors, and comets have walloped our planet. It's not always obvious, however, because erosion and other geological processes often scrub away the signs. The Earth Impact Database from the University of New Brunswick in Canada records data on 169 earthly craters, from the 300-kilometer-wide Vredefort crater in South Africa to Kansas's pipsqueak Haviland crater, a measly 15 meters across. The roster provides vital statistics for each structure, such as location, size, age, and whether it's buried or exposed. Revamped and expanded since it last appeared in NetWatch (Science, 29 January 1999, p. 599), the database now boasts information on more craters and includes references and a larger gallery.

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