首页
登录
职称英语
Look at an atlas. How are mountains shown? Where are the highest mountains? A
Look at an atlas. How are mountains shown? Where are the highest mountains? A
游客
2023-10-17
43
管理
问题
Look at an atlas. How are mountains shown? Where are the highest mountains? A few mountains stand alone, such as Mount Egmont in New Zealand, and Mount Kenya in Africa. Most mountains are found in long chains called mountain ranges. The Pennines, the Cambrian Mountains, the Alps, the Andes and Rockies are examples of mountain ranges. The highest mountain range on the Earth is the Himalayas in Asia.
In order to understand how mountains are formed, we need to know what the inside of the Earth is like. The Earth is made up of layers of rock. The outside layer of rock, the one we live on, is called the Earth’s crust. Beneath the crust is a layer called the mantle. Near the top of the mantle, some of the rocks have melted and are a liquid, like sticky tar. Because all the rocks around it press on the mantle, the molten rock tries to force its way out. If the molten rock does find a weak spot, it bursts through the Earth’s crust, forming a volcano. Some mountains were made by volcanoes.
The Earth’s crust is made up of large pieces, called plates, which fit together like the pieces of a jigsaw puzzle. Some of the plates carry continents, others carry oceans. The plates move slowly, floating on the molten rocks of the mantle below. As the plates move, they push against each other, slowly pushing up the rocks in folds to form mountains.
India used to be a long way from Asia, but gradually the plate with India on it moved closer to the plate bearing Asia. The rocks in the sea between India and Asia were pushed up in folds that now form the Himalayan mountain range. That is why it is sometimes possible to find seashells near the tops of the Himalayas. Many other mountain ranges, including the Alps, Rockies and Pen-nines , are similar great folds of rock.
While some plates are pushing together, others are moving further apart. Europe and North America are slowly moving further apart. Each year the Atlantic Ocean is a few centimetres wider. As the rocks move, they often crack or break. These breaks are called faults. Sometimes, great blocks of rocks are pushed up between two faults. These blocks may be so large and high that they form mountains. Some of the highland areas of East Africa are block mountains, so are the Vosges mountains in France and the Sierra Nevada mountains in the western United States. Block mountains often have flat tops. A flat-topped highland is called a plateau.
Questions 56—60
Complete the following form with no more than three words according to the passage.
[br]
选项
答案
a volcano
解析
(根据第二段倒数第二句“If the molten rock does find a weak spot,it bursts through the Earth’s crust,forming a volcano.”可知答案为a volcano。)
转载请注明原文地址:https://tihaiku.com/zcyy/3105498.html
相关试题推荐
______thatthepartnershipbetweenthetwocountriesreacheditshighestpoint.A
Astheplaneflewofftowardsthemountainsinthedistancethesoundofitseng
AsItrekkedthroughthemistsoftheHuangShanmountains,Icameuponayo
AsItrekkedthroughthemistsoftheHuangShanmountains,Icameuponayo
AsItrekkedthroughthemistsoftheHuangShanmountains,Icameuponayo
______thatthetradebetweenthetwocountriesreacheditshighestpoint.A、Durin
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
随机试题
TheBritishgovernmenthasdecidedtowipeouttheobesityepidemicthrough
[originaltext]Centuriesago,duringtheMiddleAges,mostofthelandinEur
Tenyearsago,JoeAllenbeganstudyingadiversegroupofseventhgradersn
试分析剥率的上升如何减少住房投资流量
身在武汉的兰先生今年38岁,至今未婚,在一家投资银行工作,收入颇丰。拥有一处无负
下列理财规划师执业过程中应注意事项的描述,正确的是()。A:对于不同的客户理财规
2016年2月,W房地产开发公司(以下简称W公司)将A市在建工程项目整体转让给甲
A. B. C. D.
2012年国家火炬计划项目总立项数2108项,其中产业化示范项目1834项,环境
高效过滤器安装前应进行外观检查,并按规范要求进行现场()。A.全面清扫
最新回复
(
0
)