Whats the difference between race and ethnicity?
a) ethnicity is related to culture; race is related to biological ancestry
b) ethnicity is determined scientifically; race is not
c) people of the same ethnicity always share the same religion; people of the same race do not
d) ethnicity is determined by the color of your eyes; race is determined by the color of your skin

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.