tectonic plates - large pieces of the lithosphere that move on top of the asthenosphere, continental drift - the theory that all of Earth's continents were once joined together into a single large landmass and then started drifting away from each other, Pangaea - the single, huge supercontinent that existed millions of years ago when all of Earth's continents were joined together, lithosphere - the layer made up of the crust and the uppermost part of the mantle, asthenosphere - the upper layer of Earth's mantle below the lithosphere, transform boundaries - where two plates slide, divergent boundaries - where two plates divide, convergent boundaries - where two plates collide, subduction - when one tectonic plate sinks below another plate, seafloor spreading - the process by which new oceanic crust forms when magma rises up and solidifies at the mid-ocean ridge,

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