Convection Currents

Convection Currents-  These movements occur in the mantle.  Hot magma is heated by being on the bottom of the mantle, near the outer core.   This heat rises and shoots up to the top of the mantle.  It cools, and falls back to the bottom of the mantle.  This constant movement in the mantle cracked the Earth’s plates and caused the continents, the rock and even the oceans to almost float above the mantle.   As the hot magma shoots upward, as it comes out through the valley of the Mid Atlantic Ridge, the two plates are pushed farther and farther apart