convection currents occur in the mantle - flow of heated fluids and where, lithosphere is solid rock - crust and upper mantle; state of matter, inner core is dense - iron and nickel, and very solid, Pangaea was the last supercontinent - means "all land," 200 million years ago, Continental Drift  - Alfred Wegener's idea , Plate Tectonics - explanation for the motion of plates, asthenosphere is like plastic - convection occurs here; like a Barbie, idea that continents moved around - Continental Drift, outer core swirls around the inner core - molten; iron and nickel and its action, seismic waves move through Earth - vibrations in the ground, and where they go,

Earth Structure and Processes

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