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Define sea-floor spreading The process by which new oceanic lithosphere forms as magma, rises to Earth's surface, and solidifies as a mid-ocean ridge Pieces of the Earth's crust that move around are called ______ tectonic plates All of the Earth's continents were part of one giant continent called ______ Pangaea Describe the movement along: Convergent Boundaries _____________, Transform Boundaries ______________, Divergent Boundaries ______________ Convergent: plates moving towards each other -> <- Transform: plates sliding past each other while moving in opposite directions Divergent: plates moving away from each other to form mid-ocean ridges <-- --> Where are the youngest rocks on the ocean found, closer to mid-ocean ridges or farther from mid-ocean ridges? closer How are tectonic plates like the pieces of a jigsaw puzzle? Because they're movable and when you put them all together they make one piece