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2016年3月SAT北美阅读真题解析+答案(五)

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   小编特地为您整理2016年3月SAT北美阅读真题解析+答案(五)相关资料,快来下载领取吧!2016年3月SAT北美阅读真题解析+答案(五)资料小编整理不易,每一份资料都是值得我们仔细去钻研的。同学们如果想顺利考出优异的成绩,提前一系列备考工作一定不要忘了哦.只有真正将资料吃透,考试时候才能得心应手。下面我们一起来看看资料内容,希望能给大家的备考带来更多的启发。

  Questions 43-52 are based on the following passage and supplementary material.

  This passage is adapted from Angus Chen, "The Dawn of Plate Tectonics:'©2014 by American Association for the Advancement of science.

  A journey to the Mariana Trench, the deepest crevice on Earth's surface, reveals the great Pacific tectonic plate descending deep into the planet where it Line recycles back into mantle rock. This recycling of old tectonic plate, called subduction, drives plate tectonics and is nothing new to scientists, but exactly when the process got started is a hot debate. A new study may put that to rest by unmasking a sequence of 4.4-billion­year-old lavas as the remnants of the first subduction zone on Earth. If correct, the discovery marks the dawn of plate tectonics and thus several geological processes critical to Earth's environment and perhaps even its life.

  In 2008, scientists studying ancient lavas in

  15 northern Quebec, known to geologists as the The team says each rock layer in the sequence at the Mariana lavas and the Nuvvuagittuq lavas describes a step in the birth of a subduction zone.ancient subduction zone. "Seeing the evolving chemical signature:'Turner says, "was much more robust than just saying there is or isn't niobium:'now, the Nuvvuagittuq rocks have been modified by intense heat and pressure "which can mask and modify geochemical signal" through contamination from nearby rocks. Furthermore, while Pearce geochemical fingerprint much, and Sleep says this is reasonable. Despite all of the difficulties of studying such timeworn rocks, he says "the work done in this paper is very valuable:'

 

 

 

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