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Keywords
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Dr. Walter Smith, plate tectonics, earthquake, volcano, Haiti earthquake, Chile earthquake, earthquake damage, prediction, natural disaster, ocean, exploration, National Oceanic and Atmospheric Administration, argonaut, Earth interior, Earth layer, crust, mantle, lithosphere, asthenosphere, mesosphere, core, inner core, outer core, convection current, Mount St. Helens, change over time, Principle of Uniformitarianism, mapping, seafloor, ocean floor, topography, continental drift, Pangaea, mid-ocean ridge, Dr. Bob Ballard, hydrothermal vent, black smoker, lava, seafloor spreading, technology, Mariana Trench, satellite, seamount, convergent boundary, divergent boundary, transform boundary, viscosity, lava, magma, volcanic eruption
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