GEOG 1350 Lecture 12: GEOG1350 - Lecture 12
1 Jun 2016
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Document Summary
Meteors objects that produce light in the sky as they streak through the earth"s atmosphere. Meteorites pieces of rock that survive the earth"s atmosphere and collide with the surface. Comets similar to asteroids, but consist of ice and rock. Occurs in an oort cloud or a belt. Definition: a cloud" compromising many billions of comets. Orbital paths are lined up in a flat plane around the sun; these plans make up an oort cloud. Example: kuiper belt beyond pluto"s orbit in the oort cloud. Think of a frisbee inside a beach ball. Iron meteorites 7. 7-8 times heavier than the equivalent volume in water (mostly ni-fe alloy) Stony-iron meteorites mg-fe rich sillicates (olivine, pyroxene) Chrondrites 93% of all meteorites, olivine and pyroxene, mg-fe rich minerals, feldspar, glass, Achrondrites stony meteorites similar to basalt, olivine, pyroxene, plagioclase feldspar (little to no iron or magnesium) The minerals remain once as meteorite brings these minerals into the earth"s organic makeup, making landing areas mineral-rich.
