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
Heavy, sour crude coking margins-and not the economics of the few remaining cracking refineries-have had a more significant effect on the economic performance of the US Gulf Coast refining industry in recent years.