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　　老托福阅读100篇相对TPO要简单一些，也是伴随托福备考学员的很重要的一份资料，对于基础薄弱，做TPO真题阅读需要过渡的考生来说再适合不过了，今天一诺留学小编给大家分享的是老托福阅读100篇之地球表面岩石的生长与分类，希望考生认真练习。

　　地球表面岩石的生长与分类

　　Any rock that has cooled and solidified from a molten state is an igneous rock. Therefore, if the Earth began as a superheated sphere in space, all the rocks making up its crust may well have been igneous and thus the ancestors of all other rocks. Even today, approximately 95 percent of the entire crust is igneous. Periodically, molten material wells out of the Earth's interior to invade the surface layers or to flow onto the surface itself. This material cools into a wide variety of igneous rocks. In the molten state, it is called magma as it pushes into the crust and lava when it runs out onto the surface.

　　All magma consists basically of a variety of silicate minerals (high in silicon-oxygen compounds), but the chemical composition of any given flow may differ radically from that of any other. The resulting igneous rocks will reflect these differences. Igneous rocks also vary in texture as well as chemistry. Granite, for instance, is a coarse-grained igneous rock whose individual mineral crystals have formed to a size easily seen by the naked eye. A slow rate of cooling has allowed the crystals to reach this size. Normally, slow cooling occurs when the crust is invaded by magma that remains buried well below the surface. Granite may be found on the surface of the contemporary landscape, but from its coarse texture we know that it must have formed through slow cooling at a great depth and later been laid bare by erosion. Igneous rocks with this coarse-grained texture that formed at depth are called plutonic.

　　On the other hand, if the same magma flows onto the surface and is quickly cooled by the atmosphere, the resulting rock will be fine-grained and appear quite different from granite, although the chemical composition will be identical. This kind of rock is called rhyolite. The most finely grained igneous rock is volcanic glass or obsidian, which has no crystals. Some researchers believe this is because of rapid cooling; others believe it is because of a lack of water vapor and other gases in the lava. The black obsidian cliffs of Yellowstone National Park are the result of a lava flow of basalt running head on into a glacier. Some of the glacier melted on contact, but suddenly there also appeared a huge black mass of glassy stone.

　　1. In the first paragraph, the author mentions that 95% of the Earth's crust is composed of igneous rock to support the idea that

　　(A) the Earth began as a molten mass

　　(B) a thin layer of magma flows beneath the Earth's crust

　　(C) the minerals found in igneous rock are very common

　　(D) igneous rock is continually being formed

　　2. The word "invade" in line 5 is closest in meaning to

　　(A) move into

　　(B) neutralize

　　(C) cover

　　(D) deposit

　　3. The word "contemporary" in line 15 is closest in meaning to

　　(A) vast

　　(B) natural

　　(C) existing

　　(D) uneven

　　4. The word "it" in line 16 refers to

　　(A) granite

　　(B) surface

　　(C) landscape

　　(D) texture

　　5. Granite that has been found above ground has been

　　(A) pushed up from below the crust by magma

　　(B) produced during a volcanic explosion

　　(C) gradually exposed due to erosion

　　(D) pushed up by the natural shifting of the Earth

　　6. Which of the following is produced when magma cools rapidly?

　　(A) granite

　　(B) plutonic rock

　　(C) rhyolite

　　(D) mineral crystals

　　7. The word "finely" in line 22 is closest in meaning to

　　(A) minutely

　　(B) loosely

　　(C) sensitively

　　(D) purely

　　8. Which of the following is another name for volcanic glass?

　　(A) Plutonic rock

　　(B) Crystal

　　(C) Lava

　　(D) Obsidian

　　答案：AACAC CAD

　　以上内容就是老托福阅读100篇之地球表面岩石的生长介绍，希望对大家的托福考试有帮助。如需了解更多留学考试的相关信息，欢迎拨打一诺留学的免费热线400-003-6508或者010-62680991进行出国留学咨询，或者点击一诺留学官方网站http://www.yinuoedu.net/页面的“在线咨询”与一诺留学专家直接对话。