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Unformatted text preview: examples + where occur within Earth. Continents Oceans Av. Density ~2.7 g/cm 3 ~2.9 g/cm 3 Av. Composition granitic (sialic) basaltic (mafic) Typical Thickness 30-60 km ~5 km (+5 km seds. + H 2 O) Sediment Cover thin-rel. thick (0-16,000 m) rel. thin (0-1,300 m) Average Height ~300 m sea level (high standing) ~5,000 m s.l. (low standing) Age 0-4,000 mill. yrs. (old) 0-185 mill yrs. (young) Stability mostly stable mostly stable Subdivisions shield + platform = craton \slope \rise abyssal plain ridge \trench Back to Outline Main page...
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- Spring '08
- Geology, Continent, Density Av. Composition, km Sediment Cover, Earth material behavior, Average Height Age