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Unformatted text preview: Geo-science 16:22 1/15/09 Outline • Plate Tectonics o Rocks • Earth Materials o Rocks o Minerals o Unconsolidated materials Testing is how theories become prevalent Plate tectonics and rocks Basalt Granite Rock materials created by 3 origins Origins • Igneous – born of fire • Metamorphic – altered rock, by heat, pressure, or circulating solution • Sedimentary – individual grains or minerals that accumulate because of fluids In motion, gravity, or because critters creating shells or internal bone structures, or as a result of the chemistry.(remains of evaporated salt water is a chemically sedimentary material) Igneous Classification based on • Color o light and dark • Grain size o Fine or course Darker colors tend to be those with a large amount of Iron and Magnesium present Lighter colors have a large amount of Silicon, Aluminum, Potassium, Calcium, Magnesium Basalt forms when magma reaches the surface and cools (when liquid it is lava) Granite cools beneath the surface therefore grains can get much larger in size Light color fine-grained rock is not very abundant Yellow In color – Rhyolite, fraction of a percent of landmass on earth, doesn’t form very often...
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- Spring '08
- Plate Tectonics, rocks Basalt Granite, Rocks Rhyolite Basalt