老托瀏覽100篇相對於TPO要簡略一些，也是隨同托福備考學員的很主要的一份材料，對付基本軟弱，做TPO真題瀏覽須要過渡的考生來講再合適不外了，本日給眾人分享的是老托瀏覽100篇PASSAGE13:地球外面巖石的發展與分類，願望考生賣力演習。
PASSAGE 13：地球外面巖石的發展與分類
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
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