sea floor spreading - a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic, mid ocean ridge - a seafloor mountain system formed by plate tectonics, trenches - long, narrow depressions on the seafloor, magnetic field reversal - the process by which the North pole is transformed into a South pole and the South pole becomes a North pole., magnetic field - a region around a magnetic material or a moving electric charge within which the force of magnetism acts., subduction - the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate., deep ocean trenches - steep depressions in the deepest parts of the ocean [where old ocean crust from one tectonic plate is pushed beneath another plate, raising mountains, causing earthquakes, and forming volcanoes on the seafloor and on land., sonar - device that bounces sound waves off underwater objects and then records th,

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