Seafloor spreading - What process makes the ocean bigger?, Subduction - What makes the ocean smaller?, Mid ocean ridge - The place where magma rises and creates new land., Deep ocean trench - The place where ocean floor goes under the continental crust., Basalt - What is the oceanic crust made of?, Outer core - What makes the magnetic field?, Mantle - Made of magma., Atlantic - Ocean that is growing., Pacific - Ocean that is shrinking., Iron - What is in the basalt., Magnetic field - Protects the earth., Magnetic field flips - Why does the iron in the oceanic crust have flipped polarities with each segment of crust?, Continental crust - Thicker, less dense, and made of granite., Oceanic crust - Thinner, denser, and made of basalt.,

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