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 Margin. Dutch LLC doesn't provide its Operating Margin figure. Also known as ROS-Return on Sales, it measures the percentage of sales revenue that gets 'returned' to the company as net profits after all the related costs of the activity are deducted.The figure is about the latest fiscal year available.lso known as ROS-Return on Sales, it measures the percentage of sales revenue that gets 'returned' to the company as net profits after all the related costs of the activity are deducted.