The beginning of the amazing events at Krakatoa in 1883 date to May 20 when there were initial rumblings and venting from the volcano, which had been dormant for about 200 years.
A refinery margin is the revenue associated with refining petroleum, expressed as a value per volume (e.g. $/L), net of the cost of the crude oil input. The simplest refining
A company's margins are a measurement of how effectively the company turns its revenue into profit. Gross margin reflects how much of its sales a company hangs on to after paying the up-front costs of producing the goods or services it sells. It's calculated by dividing gross profit divided by total revenue and expressed as a percentage.