When an
object is rotated 1/4
of a rotation how many degrees has it been turned?

90 degrees

Explanation:

360 degrees in a full circle divided by 4 = 90 degrees

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.

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.