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Download Inside Earth 1.5 Plate Tectonics
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Plate Tectonics Inside Earth Chapter 1.5 Pages 42-47 Cracks in the Earth Plate Tectonics • Scientist J. Tuzo Wilson in 1965 combined Continental Drift & Sea-Floor Spreading, creating… • Theory of Plate Tectonics: plates (pieces of Earth’s lithosphere) are in constant, slow motion, driven by convection currents in the mantle. Earth’s Plates Recall the Crust Climate • There are 3 types of boundaries in Plate Tectonic Theory 1. Convergent 2. Divergent 3. Transform • Each boundary creates a geologic feature depending on the type of crust involved – Continental – Oceanic Convergent Boundaries Climate • Definition: two plates move towards each other. (Collision Boundary) • What geologic features do Continental crust collisions create? Convergent Boundaries • Geologic Features: – Cont/Cont collision forms mountains (Himalayas) Convergent Boundaries • Geologic Features: – Cont/Ocean (Subduction boundary) • Denser Ocean plate subducts • Trenches, Volcanoes • Example: – Mt. St. Helens Convergent Boundaries • Geologic Features: – Ocean/Ocean (Subduction boundary) • Denser Ocean plate subducts • Trenches, Volcanic Island Arc • Example: – Hawaii Divergent Boundaries Climate • Definition: two plates moving apart • Geologic Features: forms a rift valley • Examples: – Great Rift Valley – Mid-Ocean Ridge Transform Boundaries Climate • Definition: Two plates slide past each other in opposite directions • Geologic Features: – Faults: break in crust North American Plate • Examples: – San Andreas Fault – Causes earthquakes Pacific Plate Boundary Diagrams Climate • Boundary: Transform • Motion: Slide past each other • Features formed: Fault • Examples: San Andreas Fault Boundary Diagrams Climate • Boundary: Convergent • Motion: Towards each other • Crust: Continental & Continental • Features formed: Mountain ranges Boundary Diagrams • Boundary: Divergent • Motion: Pull apart, move away • Features formed: MidOcean Ridge Boundary Diagrams Climate • Boundary: Convergent • Motion: Towards each other • Crust: Oceanic & Oceanic • Features formed: Subduction, Trench, Volcanic island arc Boundary Diagrams Climate • Boundary: Divergent • Motion: Pull apart, move away • Features formed: Rift Valley • Example: Great Rift Valley Boundary Diagrams Climate • Boundary: Convergent • Motion: Towards each other • Crust: Oceanic & Continental • Features formed: Subduction, Trench, Volcanoes
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