Lecture 15 - • 580 C is curie point when something cools...

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Plate Tectonics 28/03/2008 08:22:00 Continental Drift – Alfred Wegener formulated the theory of continental theory Pangea: Global continent Panthalassa: global sea Fossil evidence Mesosaurus Glossopteris Southern Continents Similar Rocks Climate / Glaciation Mechanism Plowing [iClicker] What did other scientists think of Wegener’s idea: Answer: The Idea was completely rejected Paleomagnetism The Earth has a magnetic field Solar wind interacts with the magnetic field distorting it into a huge teardrop Field flows from north pole outwards and in towards south pole. Thermal Remanent magnetism As lava cools Earth’s magnetic field is preserved in iron particles in the lava
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Unformatted text preview: • 580 C is curie point when something cools enough to allow a setup of a magnetic field, and when it gets to this point the iron in lava will line up with the earth’s magnetic field ← ← Reversal of a rocks magnetic field can indicate age ← ← Craton ← ← ← ← Passive Margin ← ← Plate Boundaires ← ← Divergent boundary ← ← Mid-ocean ridge ← ← Layers of the sea floor ← ← Pillow Basalt ← ← Hot spot ← ← East African Rift system ← ← Transform boundaries ← ← Convergent boundary ← ← Subduction zone ← ← Subduction ← ← Trench ← ← Benioff zone ← ← Ophiolite 28/03/2008 08:22:00 ← 28/03/2008 08:22:00 ←...
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