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.
The difference between Gross Profit Margin and Operating Profit Margin is that the gross profit margin accounts for only Cost of Goods sold, but the Operating Profit Margin ac â¦ counts for both Cost of Goods sold and Administration/Selling expenses.onfidence votes 1.6K. Aspiring tech guru and lover of the English word. In retail, a front margin, sometimes referred to as a gross margin, is the difference between the invoice price and the final retail price, or Gross Sales-Cost of Goods Sold.