What are ROVs an acronym for? What uses are ROV's put into?

Remotely Operated Underwater Vehicle

Explanation:

Used in situations where diving performed by humans is dangerous. Mostly used for underwater exploration in dangerous areas.

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.