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Transcript
Earth Geology- study of solid earth and processes by which it is shaped and changed Paleontology- study of prehistoric life Relative Dating Superposition Original horizontality Lateral continuity Superposition Bottom layer of rock is older than the layer on top QuickTime™ and a decompressor are needed to see this picture. Original Horizontality Refers to waterways like rivers Sediment particles settle to the bottom of rivers and streams and can cause horizontal layers QuickTime™ and a decompressor are needed to see this picture. Lateral Continuity Layers of sediment extend in all directions but can be interrupted by geologic events like new rivers or earthquakes QuickTime™ and a decompressor are needed to see this picture. Layers of the Earth Earth’s CrustContinental- older, thicker, less dense, granite Oceanic- younger, thinner, more dense, basalt Faults- crack in the crust Mantle2,900 km thick layer of molten material between crust and core on which the crustal plates float Core2 layers Inner- solid iron and nickel Outer- molten iron, nickel, oxygen Temp. = 2,000- 5,000 degrees Celcius Extremely dense- makes up 1/3 of earth’s mass Plate Tectonics Alfred Wegener- German meteorologist, 1915 wrote The Origin of Continents and Oceans Pangaea- Greek mean “all lands” Continental drift QuickTime™ and a decompressor are needed to see this picture. Theory of plate tectonics- how these continents moved Tectonics means construction or building Tectonic plates- giant pieces of solid rock on earth’s surface Movement of one plate causes movement of others QuickTime™ and a decompressor are needed to see this picture.