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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