tektites

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• tektites — n. dark glassy rock thought to be the result of meteors striking the Earth s crust (Geology) …   English contemporary dictionary

• Strewn-fields of tektites — ▪ Table Strewn fields of tektites types names age (millions of years) microtektites Muong Nong splash form australite remarks North American tektites, viz., bediasites (Texas), georgiaites 35.4 X X very low in magnesium, calcium moldavites 14.6 ? …   Universalium

• Tektite — Tektites (from Greek tektos , molten) are natural glass objects up to a few centimeters in size, which most scientists argue were formed by the impact of large meteorites on Earth s surface. Tektites are typically black or olive green, and their… …   Wikipedia

• tektite — /tek tuyt/, n. Geol. any of several kinds of small glassy bodies, in various forms, occurring in Australia and elsewhere, now believed to have been produced by the impact of meteorites on the earth s surface. [1920 25; < Gk tekt(ós) molten +… …   Universalium

• John A. O'Keefe — John Aloysius O Keefe (1916 – 2000) was a planetary scientist with the National Aeronautics and Space Administration (NASA) from 1958 to 1995. He is credited with the discovery of Earth s pear shape using U.S. Vanguard satellite data collected in …   Wikipedia

• Tectita — Una tectita. Las tectitas (del griego tektos, fundido, a veces escrito tektita) son objetos de vidrio natural, de algunos centímetros o milimetros en tamaño que, de acuerdo a la mayoría de los científicos, se han formado por el impacto de grandes …   Wikipedia Español

• Tollmann's hypothetical bolide — Alexander Tollmann s bolide, proposed by Kristen Tollmann and Tollmann (1994), is a hypothesis presented by Austrian geologist Dr. Alexander Tollmann, suggesting that one or several bolides (asteroids or comets) struck the Earth at 7640 BCE… …   Wikipedia

• Edward C. T. Chao — (Edward Ching Te Chao) (November 30, 1919 ndash; February 3, 2008) was one of the founders of the field of impact metamorphism, the study of the effects of meteorite impacts on the Earth s crust.Born in Suzhou, China, he was best known for… …   Wikipedia

• Microspherulite — Microspherulites are microscopic spherical particles with < 2 mm diameters, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means stone ). Only bodies created by natural physico chemical… …   Wikipedia

• Impact crater — The prominent impact crater Tycho on the Moon. In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body. In most common usage,… …   Wikipedia

• Australasian strewnfield — The Australasian strewnfield, covering at least one tenth of the Earth s surface, is the largest and the youngest of the tektite strewnfields. The 800,000 year old strewnfield includes most of Southeast Asia (Vietnam, Thailand, Southern China,… …   Wikipedia