Oceanic crust choose one: a. is composed of gabbro and basalt overlain by sediment. b. gets younger the farther you go from the ridge axis. c. is thicker and denser than continental crust. d. comprises broad continental shelves along active continental margins and much narrower shelves along passive margins.

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.