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.
托福词汇记忆两大误区解决办法
高分必备:托福写作中的得分点
托福词汇记忆方法优缺点介绍
托福写作词汇活用 向高分突进
少用第二人称:总结托福写作需注意的语法点
托福写作技巧:取代said用法
托福阅读词汇选集(1):A
托福考试写作模板4
历年托福考试高频词汇-readily
托福写作技巧:对中式英语说不
托福考试写作模板1
托福听力背景词汇:预约医生
托福词汇:"And"特殊用法及汉译
托福独立写作中易犯的十个错误
托福词汇记忆方法分享:单词拆分法 逐个击破
托福写作满分心得:挖掘句子多样性
托福考试词汇使用小技巧
托福作文范文:人类与地球的关系
托福词汇记忆方法优缺点介绍
历年托福考试高频词汇-tap
托福阅读词汇选集(5):DE
历年托福考试高频词汇-pension
托福阅读词汇选集(2):ABC
托福考试写作模板7
托福单词拆分有效帮助记忆
托福考试写作模板6
历年托福考试高频词汇-realism
托福写作高分备考之“时间轴式”复习计划
历年托福考试高频词汇-realm
托福阅读词汇选集(4):CD
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |