Because of large reserves that center around the persian gulf, the middle east often produces as much as two-thirds of the world’s supply of a. water b. cattle c. coal d. petroleum

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.

an economic of depression