How do convection currents inside earths mantle affect the movement of the plates that makeup earth crust?

Magma is the molten rock below the crust, in the mantle. Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust.

Copper, silver, aluminum, cobalt, chromium, mercury 

Matter- occupies space and possesses rest massno matter is the opposite