A stationary front occurs when two air masses meet but neither one can move the other. Knowing that, in what way would a population be said to be stationary? ​

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.

answerinternational border(ib);

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.