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
53
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
plates
解析
(根据第三段第一句“The Earth’s crust is made up of large pieces,called plates…”可知答案为plates。)
转载请注明原文地址:https://tihaiku.com/zcyy/3105496.html
相关试题推荐
______thatthepartnershipbetweenthetwocountriesreacheditshighestpoint.A
______thatthepartnershipbetweenthetwocountriesreacheditshighestpoint.A
Astheplaneflewofftowardsthemountainsinthedistancethesoundofitseng
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
Developingapeaceful,understanding,andsupportiverelationshipbetweenpare
Itisdifficulttogiveadescriptionof【C1】______becausetheyvaryfromstat
FedExCorpoffersintegratedbusinessservicesthroughanetworkofsubsidiaries
对仪器设备进行符合性评定时,如果设备汞值误差的不确定度小于或等于被评定设备的最大
患者男性,56岁,近日夜间出现阵发性胸部闷涨胀,伴出汗,每次持续数分钟,白天多无
SF6开关气体压力降低,检查人员应按规定使用防护用品;若需进入室内,应开启所有排
关于实用性社会性别需求和战略性社会性别需求,下列说法正确的有()。A.实用性需
基金管理公司撤销办事处或变更办事处,不需报中国证监会备案。()
中国工商银行的价值观是()A.臻于至善,厚德正盛B.大行德广,
羌活商品药材按形态分为A.根羌 B.竹节羌 C.大头羌 D.条羌 E.蚕
最新回复
(
0
)