Lecture 17-new

Lecture 17-new - Lecture 17 Plate Tectonics and Climate...

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Lecture 17: Plate Tectonics and Climate Change Plate Tectonics is a paradigm developed recently (1960’s) to explain many aspects of Earth (or any planetary) dynamics - volcanoes, earthquakes, mountain building, etc. It combines continental drift and sea-floor spreading plus more.
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The Unifying Theory of PLATE TECTONICS The Earth’s surface is made up of seven large lithospheric plates (North America, South America, Africa, Eurasia, Australia, Antarctica) and smaller plates Three types of plate boundaries Constructive (divergent) = mid ocean ridges Destructive (convergent) = trenches Conservative = transform faults Plates move smoothly on the top of aesthenosphere Plate movements are driven by gravity and mantle convection(?)
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Major Lithospheric Plates
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Three main types of Plate Boundaries. Transform Divergent Convergent
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Mid-oceanic ridges The place where magma wells up, creating new oceanic crust as the plates spread apart
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Closer view of mid-ocean ridge -most extensive mountain belts on Earth -broad features -commonly contain axial valley 1000 km
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Plate tectonics: plates formed from mantle melts. Then plates subducted back into mantle.
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Lecture 17-new - Lecture 17 Plate Tectonics and Climate...

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