GEO 101 Lecture Notes - Lecture 7: Continental Crust, Oceanic Crust, Nazca Plate
26 Jul 2020
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Document Summary
Observed and predicted changes annual avg temperature. Annual average temperatures are projected to increase. Burning fossil fuels in cars, industry and homes. Ice cores- store past samples of the atmosphere. Seasonal biological activities are happening 15-20 days earlier than several. The weakness of wegner"s theory continents slide over ocean floor. Continental drift is one feature of the modern theory of plate tectonics. Plate tectonics is the theory to explain how the outer layers of the earth move and deform. Continents are not exactly divided by plate. Plate boundaries can be continental or oceanic crust. Development of sonar mapping the ocean floor. Circulation carries the lithospheric plates across the surface. At spreading centers uprising of magma cools at the surface forms new crust. Patterns of mountain belts, faults, and catastrophic events. Plates converging or being pulled apart= stress. Crust type determines the outcome of colliding plates. Oceanic crust boundary (denser) is dragged downward under continental crust.
