首页
登录
职称英语
What Causes Earthquakes? People have tried to explain the
What Causes Earthquakes? People have tried to explain the
游客
2024-08-08
51
管理
问题
What Causes Earthquakes?
People have tried to explain the cause of earthquakes since earliest times. Some people thought that quakes were sent from heaven to punish the wicked. Others believed that the earth rested on the backs of animals. We now have more scientific explanations of the cause of these destructive earth tremors. Earthquakes are evidence that some process is at work below the surface of the earth. Large bodies of magma may be in motion. These and other internal movements can result in a sudden release of energy by breaking the overlying, brittle rocks. During earthquakes, rocks beneath the surface are clearly bent and broken. In other cases deformation takes place slowly and without recognizable earthquake shocks. For example, in a drill hole in the Great Valley of California, earth movements have been measured for years. The rocks here are moving at a rote of about one meter per century. In some places pressure slowly builds up until the rocks break and quickly snap back into position. The faulting releases energy that may have built up in the rocks for hundreds or thousands of years. This sudden burst of energy causes vibrations that travel through the rocks. These vibrations are an earthquake. Most earthquakes are so small that they can be detected only by sensitive instruments along the fault surface. However, energy may continue to trickle off in aftershocks. These shocks are much less severe than the main shock and may continue for months after the initial earthquake.
Summary:
Scientifically speaking, earthquakes are caused when【71】movements of the earth suddenly release energy by breaking the overlying rocks on the surface. During earthquake, rocks are clearly bent and broken. Elsewhere, rocks may slowly【72】over many years. Then the pressure may increase until the rocks break and snap back. This break【73】the energy in the rocks and causes vibrations. Most earthquakes are so small that they can be barely【74】, but large violent earthquakes can destroy inhabited areas. Sometimes【75】many follow after the first movement. [br]
选项
答案
internal
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3710750.html
相关试题推荐
Whichdiagramshowsthepercentageofyoungpeopleusetheirmobilephonesatle
Whichdiagramshowsthepercentageofyoungpeopleusetheirmobilephonesatle
Whichdiagramshowsthepercentageofyoungpeopleusetheirmobilephonesatle
Whichdiagramshowsthepercentageofyoungpeopleusetheirmobilephonesatle
WhatkindofpeopledidTinachoosetowriteaboutinherfirstcolumn?[br][o
WhatkindofpeopledidTinachoosetowriteaboutinherfirstcolumn?[br][o
WhatkindofpeopledidTinachoosetowriteaboutinherfirstcolumn?[br][o
Attheendofabanquet10peopleshakehandswitheachother.Howmanyhandshak
Manypeoplelivingaroundthestadium______abouttheviolentbehaviourofthe
Somepeoplearguethatthesolution______thedrugproblemiseducation,andwhil
随机试题
Byeducation,Imeantheinfluenceoftheenvironmentupontheindividualto
Whichofthefollowingprepositionalphrasescanfunctionasanadverbial?A、They
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
Springisa【B1】________season.Thetemperaturesaremild,andtheblooming
在野外常见的边坡变形破坏类型中,边坡岩体主要在重力作用下向临空方向发生长期缓慢的
小学科学《证明地球在自转》 注:图片节选自教育科学出版社小学科学五年级下册
工业销售成品价值不包括()。A.实际销售的成品价值 B.定货者来料加工的成
埃里克森认为,自我同一性与个体职业的选择、性别角色形成、人生观的形成有着密切联系
以下不属于肺的宣发功能的是A.排出体内浊气 B.宣散卫气 C.输布津液,外达
软件企业的下列支出,在计算应纳税所得额时可在发生当期据实扣除的有()。A.
最新回复
(
0
)