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
1. refining-the process of removing impurities (as from oil or metals or sugar etc.). purification, refinement. processing-preparing or putting through a prescribed procedure; the processing of newly arrived immigrants; the processing of ore to obtain minerals.. refining-the process of removing impurities (as from oil or metals or sugar etc.). purification, refinement. processing-preparing or putting through a prescribed procedure; the processing of newly arrived immigrants; the processing of ore to obtain minerals.