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
2024-08-14
6
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/3720112.html
相关试题推荐
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountains?A
Simonrentsacarinthecitytogoskiinginthemountains10kilometresaway.H
Igorwasboththe15thhighestandthe15thlowestinatennistournament.Howma
Lookatanatlas.Howaremountainsshown?Wherearethehighestmountai
The"BackboneofEngland"refersto______.A、TheGrampianMountainsB、ThePennin
随机试题
Intermediategoalscanbesetatweeklyormonthly________,dependingonthetim
"TheGooglebrandhastakenonalifeofitsown,"concedesJimLanzone,the
具有一定支付能力和闲暇时间的消费者在一定时期内,按一定的价格购买的旅游产品的数量
基坑土方工程验收必须以确保()为前提。A.支护结构安全 B.周围环境安全
A.Ⅰb B.Ⅱa C.Ⅰc D.Ⅰa E.Ⅱb肿瘤局限于双侧输卵管,未
A.抑制甲状腺素释放B.损伤甲状腺实质细胞C.抑制TSH释放D.能抑制T4脱碘成
下列属于公路运输的缺点的是()。A.机动灵活,货物损耗小 B.运输能耗高
经济性,是指工程从规划、勘察、设计、施工到整个产品使用寿命周期内的成本和消耗的费
【背景资料】 某大桥主桥为四跨一联的预应力混凝土连续箱梁桥,最大跨径120
A.神灵医学心理学时代 B.哲学医学心理学时代 C.科学医学心理学时代 D
最新回复
(
0
)