Alfred Wegner - German Scientist who said all the continents  were one big land mass, Lithosphere - crust and uppermost part of the mantle, PANGEA - The single land mass that broke apart and became today's continents, Continental Drift - The continents slowly moved across the Earth, Asthenosphere - partially melted portion of the mantle below the lithosphere, Plate Tectonic Theory - states that Earth's surface is broken into large, rigid pieces that move with respect to each other, Subduction - occurs when one tectonic plate moves under another tectonic plate, Divergent Boundary - where two plates move away from each other, Convergent Boundary - where two plates move toward each other, Transform Boundary - where two plates slide past each other, Convection Currents - The flow that transfers heat within a fluid, Tectonic Plate - Lithosphere broken into large pieces, Harry Hess - American scientist who discovered Seafloor Spreading, transform boundaries and volcanic arcs,

Inside the Earth, Continental Drift, Plate Tectonics & Plate Boundaries

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