Evidence Evidence for Continental Drift: Evidence for Plate Tectonics:

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Presentation transcript:

Evidence Evidence for Continental Drift: Evidence for Plate Tectonics: Continental Puzzle (Pangaea, the Urkontinent) Matching fossils on different continents Matching rock types & mountains on different continents Evidence for Plate Tectonics: Paleomagnetism preserved in seafloor rock layers Distribution of earthquakes/ volcanoes along fault lines Age of the sea floor rocks/ocean drilling Hot spots

Matching fossils: Matching rock types:

Paleomagnetism Earth’s magnetic poles switch periodically Rocks formed are magnetic and point to magnetic North

Age of the Sea Floor/Ocean Drilling As we move away from ridges, rocks get older Radiometric dating of ocean cores Benthic Foraminifera, Courtesy USGS

Hot Spots Plume of magma in the middle of a plate Hot spot stays when the plate moves & creates islands examples: Hawaii Iceland Yellowstone