Plate Tectonics: The Grand Unifying Theory of Geology

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Mid-Ocean Ridges • Linear mountain ranges in Earth’s ocean basins. • Example: <strong>The</strong> Mid-Atlantic Ridge – Snakes N-S through the entire Atlantic Ocean. – Elevated ridge 1,500 km wide and 2 km above abyssal plains.
Why Are Mid-Ocean Ridges Elevated? Mid-ocean ridges are high above most <strong>of</strong> the seafloor This is because new oceanic crust is warmer and less dense, and very little lithosphere has been added, close to the ridges. Further from the ridges, the crust is cool and more dense, and the thicker lithosphere adds even more weight, pulling the whole lithosphere down into the asthenosphere
Page 1 and 2: Plate Tectonics The Grand Unifying
Page 3 and 4: Elevations and Lithospheric Loading
Page 5 and 6: Why Are Continents Higher? • Cont
Page 7 and 8: Plate boundaries are zones of many
Page 9 and 10: The Major Plates of Earth’s Litho
Page 11 and 12: Type 2 - Convergent Plate Boundary
Page 13 and 14: Divergent Boundaries • Sea-floor
Page 15: New Oceanic Crust at Mid-Ocean Ridg
Page 19 and 20: Pillow Pillows In The Field Pillow
Page 21 and 22: Convergent Plate Boundaries: Subduc
Page 23 and 24: Convergent Boundaries • Accretion
Page 25 and 26: The Wadati-Benioff Zone • How do
Page 27 and 28: Subduction and Island Arcs Island A
Page 29 and 30: Transform Boundaries • Lithospher
Page 31 and 32: Transform Plate Boundaries - No Net
Page 33 and 34: SAF Aerial View
Page 35 and 36: Hot Spots • Not all volcanoes on
Page 37 and 38: The orientation of the Hawaiian arc
Page 40 and 41: The Birth of a Divergent boundary
Page 42 and 43: • The western U.S. - most of Neva
Page 44 and 45: What Drives Plate Motions? • The
Page 46 and 47: • Thanks to GPS and other geodeti
Page 48 and 49: Relative Plate Velocities Ignore re

Plate Tectonics: The Grand Unifying Theory of Geology

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