Plate tectonics - Suzie Alquran Professor Whitcomb ESC1000...

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Suzie Alquran Professor Whitcomb ESC1000 25 February 2018 1. What is lithosphere and what is asthenosphere? You may want to look this up in your text. The lithosphere is the rigid outer part of the earth, consisting of the crust and upper mantle. The asthenosphere is the upper layer of the earth’s mantle, below the lithosphere, there is low resistance to plastic flow and convection will occur. 2. How do the tectonic plates move? Describe the evidence for plate motion that came from hot spots. The main force on plate tectonics is gravity. Plates with oceanic lithosphere meet other plates then they dive under another and sinks into the mantle. Then the sinking oceanic lithosphere will drag the rest of the tectonic plate causing plate motion. 3. Describe how continental rifting creates divergent tectonic plate boundaries. Rifting is the process by when the continental lithosphere stretches. The stretching of the lithosphere causes the plates to move away from each other which is what divergent boundaries are. If they did not stretch they wouldn’t be able to seperate from one
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  • Spring '10
  • idk
  • Plate Tectonics, Continental Rifting, tectonic plates move, Suzie Alquran, Professor Whitcomb

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