Unit 8 Popular ScienceLesson 22(EC)Oil(1)By G. C. ThornleyThere are three main groups of oil:animal, vegetable and mineral. Great quantities of animal oil come from whales, those enormous creatures of the sea which are the largest remaining animals in the world. To protect the whale from the cold of the Arctic seas, nature has provided it with a tick covering of fat called blubber. When the whale is killed, the blubber is stripped off and boiled down, either on board ship or on shore
