class 7 - OCE1001 2 Elementary Oceanography Fall 2011 1...

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2 1 OCE1001 Elementary Oceanography Fall 2011
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2 2 Reading Assignments Reading for Exam 1 Introduction, Appendices 1, 2, 3 Ch 1: Planet Earth Ch 2: Plate Tectonics Ch 3: Marine Provinces Ch 4: Sediments (112-115; 122-125) Ch 16: Climate Change
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2 3 Global Plate Tectonics •A revolutionary theory formulated in the 1960s •Two basic assumptions: – Earth is not expanding – Earth’s surface is divided into “plates.” A Science Odyssey – Origins (part 3/11)
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2 4 Global Plate Tectonics • Ocean crust is destroyed at subduction zones. – So, amount of seafloor built at spreading centers = amount lost in subduction zones.
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2 5 Lithospheric Plates • Lithosphere = rigid – Crust and uppermost mantle • Asthenosphere = plastic, flows - Upper mantle Limited motion Mesosphere Plastic flow
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2 6 Global Plate Tectonics • 3 types of boundaries: 1)Midocean ridges Plates diverge 2)Subduction zones Plates converge 3)Transform faults Lateral movement Locate on the diagram where plates are moving in opposite directions?
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This document was uploaded on 10/31/2011 for the course STAT STA2023 at FSU.

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class 7 - OCE1001 2 Elementary Oceanography Fall 2011 1...

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