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
The result is a gross refining margin which includes the cost of operating the refinery as well as the profits for the refining company. The price of crude oil is based on the daily market price for crude oil from the Alaska North Slope published in the Wall Street JournalÂ©.