53. the columbia plateau in the northwestern u. s. was constructed (built up by) a, a shield volcano b. repeated violent eruptions c. a series of fissure eruptions that released a huge volume of low-viscosity basalt flows d. a series of subaqueous lava flows

c. a series of fissure eruptions that released a huge volume of low-viscosity basalt flows

Explanation:

The Columbia Plateau in the northwestern U.S, commonly known as the Columbia Basalt Plain as well, is a pronounced geographic area located in the interior Columbia River Basin. It originated at a point between six million and sixteen million years ago due to a series of flows of basalt.

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.

where is the picture? ?