There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements. CROSS SECTION shows Earth's structure.
â The operating margin was an especially useful metric or ratio during the meeting as we wanted the discussion to include revenue statistics.
operating load meaning, operating load definition | English Cobuild dictionary. operating. Operating profits and costs are the money that a company earns and spends in carrying out its ordinary trading activities, in contrast to such things as interest and investment. The group made operating profits of Â£80m before interest.