The transfer of energy in liquids and gases as groups of molecules move in currents is Convection
Conduction
Radiation
Convection currents

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods