Lecture 6 - continental drift away from each other •...

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Lecture #6: Continental Drift & Seafloor Spreading Continent to continent collision- A phenomenon of plate tectonics of Earth that occurs at convergent boundaries. Convection- Hot materials rise and cool materials sink. Convergent boundary- The down-going crust melts at depth to produce liquid rock called magma. Creates a volcano. Divergent boundary- crust move apart. Also called mid-ocean ridges. Causes sea-floor spreading. Molten mantle rises and fills up to fill the gap. The liquid mantle cools, adding material to each side of the separating oceanic crust. Mid-ocean ridges- Sea-floor spreading drives the separation of oceanic crust and the
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Unformatted text preview: continental drift away from each other. • Plate tectonics/tectonic plate- Separation of Pangaea. • Subduction- One plate dives back into the mantle. Recycles the Earth’s crust. Balanced by sea-floor spreading so that Earth maintains a constant circumference. • Volcanic arc (island and continental)- Continental Arc Volcanoes is known as the Cascade Range. Happening along the Pacific Northwest. Island Arc Volcanoes of Alaska called the Aleutian Islands. Moving north and subducting with the part of the North American crust that is oceanic....
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