Completar frases Convection Versión en línea How does heat transfer through liquids and gasses? por Aaron Stinson 1 density contraction current liquids gasses expansion convection climate The transfer of thermal energy by the movement of particles from one part of a material to another is called , convection occurs in fluids and . Convection occurs , in part , because of difference in due to thermal and thermal in different parts of the material Te movement of fluids up and down in a cycle because of convection is called a convection , these currents cause patterns in Earth .