Oil Refining
An important new industry, oil refining, grew after the Civil War. Crude oil, or petroleum -- a dark, thick ooze from the earth -- had been known for hundreds of years, but little use had ever been made of it. In the 1850s Samuel M. Kier, a manufacturer in western Pennsylvania, began collecting the oil from local seepages and refining it into kerosene. Refining, like smelting, is a process of removing impurities from a raw material. Kerosene was used to light lamps. It was a cheap substitute for whale oil, which was becoming harder to get. Soon there was a large demand for kerosene. People began to search for new supplies of petroleum. The first oil well was drilled by E. L. Drake, a retired railroad conductor. In 1859 he began drilling in Titusville, Pennsylvania. The whole venture seemed so impractical and foolish that onlookers called it Drakes Folly. But when he had drilled down about 70 feet , Drake struck oil. His well began to yield 20 barrels of crude oil a day. News of Drakes success brought oil prospectors to the scene. By the early 1860s these wildcatters were drilling for black gold all over western Pennsylvania. The boom rivaled the California gold rush of 1848 in its excitement and Wild West atmosphere. And it brought far more wealth to the prospectors than any gold rush. Crude oil could be refined into many products. For some years kerosene continued to be the principal one. It was sold in grocery stores and door-to-door. In the 1880s refiners learned how to make other petroleum products such as waxes and lubricating oils. Petroleum was not then used to make gasoline or heating oil.
SAT阅读备考的四个疑问解答
提高SAT阅读速度和准确率的方法指导
SAT阅读高分的关键:阅读量
SAT阅读备考中的常见问题
SAT阅读长对比的难点及备考方法指导
SAT阅读单词与句子的游戏
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SAT阅读技巧要建立在大量阅读的基础上
SAT阅读必知的文学术语
如何根据SAT阅读考试特点和题型提升分数?
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SAT阅读考试介绍
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SAT阅读考试的要点解读
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得阅读者得天下 SAT阅读五大策略分享
SAT阅读背景知识补充材料:文学术语(一)
SAT阅读填空题常考单词整理(7)
SAT阅读的做题时间安排参考
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破解SAT阅读的基本是提高自己的阅读能力
SAT阅读背景知识补充材料:文学术语(二)
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