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18 Cards in this Set
- Front
- Back
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Cratons
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large portions of continents that have not undergone substantial tectonic deformation since early Paleozoic time
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Precambrian shield
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large Precambrian portion of a craton that is exposed at Earth's surface
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Meteorites
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extraterrestrial objects that have been captured in Earth's gravitational field and have crashed into our planet
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Stony Meteorites
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meteorites that consist of rocky material
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iron meteorites
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meteorites that are metallic and contain small amounts of elements other than iron
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Stony iron meteorites
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meteorites that consist of mixtures of rocky and metallic material
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asteroids
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small planet-like bodies
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Comets
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bodies of dirty ice with rocky cores
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Big Bang
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event in which matter exploded
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redshift
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evidence that the universe is expanding makes it possible to estimate its age; increase in wavelengths of light waves traveling through space
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Supernova
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an exploding star that casts off matter of low density
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solar nebula
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dense cloud assumed to have had some rotational motion when it formed and must then have rotated more and more rapidly as it contracted
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Magma Ocean
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less dense silicates must have floated to the surface
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Protocontinents
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small continents formed from the numerous felsic bodies of rock that emerged in the course of Archean time eventually coalesced
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terrane
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geologically distinctive region of Earth's crust that has behaved as a coherent crustal block
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Greenstone Belts
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over broad regions stratified bodies sit in masses of high grade metamorphic rocks of felsic composition
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banded iron formations
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cherts and the iron rich sedimentary rocks
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chemosynthesis
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processes employed by the warm adapted prokaryotes are producers but don't use light as an energy source
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