自然科学类托福阅读之Investigation of the Deep-Ocean-智课教育旗下智课教育.pdf

智 课 网 托 福 备 考 资 料 自然科学类托福阅读之Investigation of the Deep-Ocean-智课教育旗下智课教育 自然学科是托福阅读文章题材中比较常见的类型，本文和大家分享 的是自然科学类文章汇总系列的内容，供考生参考使用，希望考生能够 认真备考，预祝考生能够考出好成绩。 自然学科是托福阅读文章题材中比较常见的类型，本系列为大家汇 总整理了多篇托福阅读自然科学类文章 ，大家在托福备考时可以有针对 性的进行复习，本篇为大家带来的是Investigation of the Deep-Ocean，并附有相应的练习，希望大家都能顺利拿下托福阅读 高分。 Investigation of the Deep-Ocean Keywords: ocean, researchers, techniques, samples, rocks The ocean bottom a region nearly 2.5 times greater than the total land area of the Earth is a vast frontier that even today is largely unexplored and uncharted, until about a century ago, the deep-ocean floor was completely inaccessible, hidden beneath waters averaging over 3,600 meters deep. Totally without light and subjected to intense pressures hundreds of times greater than at the Earths surface, the deep-ocean bottom is a hostile environment to humans, in some ways as forbidding and remote as the void of outer space. Although researchers have taken samples of deep-ocean rocks and sediments for over a century, the first detailed global investigation of the ocean bottom did not actually start until 1968, with the beginning of the National Science Foundations Deep Sea Drilling Project (DSDP). Using techniques first developed for the offshore oil and gas industry. The DSDPs drill ship, the Glomar Challenger, was able to maintain a steady position on the oceans surface and drill in very deep waters, extracting samples of sediments and rock from the ocean floor. The Glomar Challenger completed 96 voyages in a 15-year research program that ended in November 1983. During this time, the vessel logged 600,000 kilometers and took almost 20,000 core samples of seabed sediments and rocks at 624 drilling sites around the world. The Glomar Challengers core samples have allowed geologists to reconstruct what the planet looked like hundreds of millions of years ago and to calculate what it will probably look