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.
Margin Ratios. 1  Gross Profit Margin: The gross profit margin looks at cost of goods sold as a percentage of sales. 2  Operating Profit Margin: Operating profit is also known as EBIT and is found on the company's income statement.