Thevolcanoisoneofthemostsurprisingfrighteningforcesofna...
问题详情:
The volcano is one of the most surprising frightening forces of nature. Maybe you have seen pictures of these “fireworks” of nature. Sometimes when a volcano erupts, a very large wall of melted rock moves down the side of a mountain. It looks like a “river of fire.” Sometimes volcanoes explode, throwing the melted rock and ashes high into the air. But where does this melted rock come from?
The earth is made up of many layers. The top layer that we see is called the crust. Under the crust are many layers of hard rock. But far, far beneath the crust whose rock is so hot, that it is soft. In some places it even melts. The melted rock is called magma. Sometimes the magma breaks out to the surface through cracks(爆裂声)in the crust. These cracks are volcanoes.
Most people think of mountains when they think of volcanoes. But not every mountain is a volcano. A volcano is simply the opening in the earth from which the magma escapes. The hot magma, or lava as it is called, cools and builds up on the surface of the earth. Over thousands of years, this pile of cooled lava can grow to be very, very big. For example, the highest mountain in Africa, Kilimanjaro, is a volcano. It towers more than 16,000 feet above the ground around it.
1. Which words in the passage have the same meaning as “melted rock”?
A. “Volcano” and “explode” B. “Crust” and “hard rock”
C. “magma” and “lava” D. “Volcano” and “magma”
2. Which is the correct order of the layers of the earth(beginning with the top layer)?
A. crust----hard rock------magma-----soft rock
B. crust-----hard rock----- soft rock-----magma
C. magma-----soft rock----- hard rock-----crust
D. volcano-----cracks------magma------crust
3. The best title(标题) of the passage should be________.
A. The Volcano B. Kilimanjaro Volcano C. The Mountains D. The Melted Rock
【回答】
CBA
知识点:阅读理解
题型:未分类
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已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为 ( ) A.FeO ...
问题详情:已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为()A.FeO B.Fe2O3C.Fe3O4 D.无法判断【回答】B知识点:金属的化学*质题型:选择题...
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如图,形状相同、大小相等的两个小木块放在一起,其俯视图如图所示,则其主视图是( ).
问题详情:如图,形状相同、大小相等的两个小木块放在一起,其俯视图如图所示,则其主视图是( ).【回答】D知识点:三视图题型:选择题...
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简答题(选做一题)(5分)20.阅读下面《红楼梦》选段,依据原著故事情节,回答问题。一句话未了,忽见一个老婆子...
问题详情:简答题(选做一题)(5分)20.阅读下面《红楼梦》选段,依据原著故事情节,回答问题。一句话未了,忽见一个老婆子忙忙走来,说道:“这是那里说起!金钏儿姑娘好好的投井死了!”金钏儿因何投井自尽?她死后,王夫人和宝钗对此作何反应?请简述。21.阅读下面《欧也妮·葛朗台》选段,...
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如图中,A、B、C、D、E是单质,G、H、I、F是B、C、D、E分别和A形成的二元化合物,已知:①反应C+G ...
问题详情:如图中,A、B、C、D、E是单质,G、H、I、F是B、C、D、E分别和A形成的二元化合物,已知:①反应C+G B+H能放出大量的热,G是红综*固体粉末;②I是一种常见的温室气体,它和E可以发生反应:2E+I2F+D,F中的E元素的质量分数为60%.回答问题: ⑴①中反应的化学方程式为 ...
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