UNT GEOL 1610 - Plate tectonics (3 pages)

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GEOL 1610 1st Edition Lecture 4 Outline of Last Lecture I Igneous Rock II Magma III Lava important points IV Origins of magma V Divergent plate Boundaries VI Convergent Plate Boundaries VII Crystallization VIII Igneous Textures IX Most important intrusive rick textures X Chemistry of Igneous Rocks XI What is Bowen s Reaction series XII How do magmas change XIII Economic important of igneous rocks Outline of Current Lecture I This Dynamic Earth plate tectonics II The historical perspective III What causes all this IV Developing the Theory V Ocean floor mapping VI Magnetic stripping and polar reverses VII Sea Floor Spreading VIII Concentration of earthquakes IX Divergent boundaries These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Current Lecture I II III IV V VI VII This Dynamic Earth a Plate tectonics influence all processes b We can t control them but we can learn from them The historical perspective a Plate large slab of rock b Earth surface built of these plates c Large and small plates are moving d Present day continents are actually fragments of a large continent Pangaea What causes all this a 17th century people thought the earth was shaped through giant catastrophes b 19th century that way of thinking changes earth was shaped through time c 3 main layers crust mantle core d Lithosphere litho stone e Asthenosphere hot semi solid material f The Americas were torn away from Africa by earthquakes and floods g Continental drift 200 billion years ago Pangaea began to break apart h 2 large continental masses first then break apart into smaller continent fossils compared on coasts i These organisms couldn t have swam across the ocean j Tree fossils in Antarctica suggest it was closer to the equator while Africa has ice deposits k People couldn t accept this idea at first Developing the Theory a Debated off and on for decades Ocean floor mapping a 70 of earth s