The cycle of heating, rising, cooling and sinking is called a

The cycle of heating, rising, cooling and sinking is called a convection current. These currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over. 

Pancreassalivary glandsliverlachrymal glandssweat glandoil glandsgoblet cells

This movement is also referred to as  glacial plucking