首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Eastern Quakes Can Trigger Big Shakes In the first week of November 2011, people in central Oklahoma experienced more than tw
Eastern Quakes Can Trigger Big Shakes In the first week of November 2011, people in central Oklahoma experienced more than tw
admin
2012-12-06
32
问题
Eastern Quakes Can Trigger Big Shakes
In the first week of November 2011, people in central Oklahoma experienced more than two dozen earthquakes. The largest, a magnitude 5.6 quake, shook thousands of fans in a college football stadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV, you see reports about all sorts of natural disasters —hurricanes, tornadoes, flooding and wildfires, to name a few. But the most dangerous type of natural disaster, and also the most unpredictable, is the earthquake.
Researchers at the U.S. Geological Survey estimate that several million earthquakes rattle the globe each year. That may sound scary, but people don’t feel many of the tremors because they happen in remote and unpopulated regions. Many quakes happen under the ocean, and others have a very small magnitude, or shaking intensity.
A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011, was felt from central Georgia to southeastern Canada. In many urban areas, including Washington, D.C., and New York City (Wall Street shown), people crowded the streets while engineers inspected buildings. Credit: Wikimedia/Alex Tabak
Scientists know about small, remote quakes only because of very sensitive electronic devices called seismometers. These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether, USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.
Although earthquakes can happen anywhere in the world, really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen, on average, only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.
Tectonic plates are huge pieces of Earth’s crust, sometimes many kilometers thick. These plates cover our planet’s surface like a jigsaw puzzle. Often, jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other earthquakes occur. On average, tectonic plates move very slowly — about the same speed as your fingernails grow.
But sometimes earthquakes rumble through portions of the landscape far from a plate’s edges. Although less expected, these “mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today, scientists are still puzzling over why the quakes occurred and when similar ones might occur.
The earthquake is the most unpredictable natural disaster.
选项
A、Right
B、Wrong
C、Not mentioned
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/iLQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
TryingtoFindaPartnerOneofthemoststrikingfindingsofarecentpollintheUKisthatofthepeopleinterviewed,one
ProlongingHumanLifeProlonginghumanlifehasincreasedthesizeofthehumanpopulation.Manypeoplealivetodaywouldha
TryingtoFindaPartnerOneofthemoststrikingfindingsofarecentpollintheUKisthatofthepeopleinterviewed,one
Itisobviousthatithasbeentoolatetotakeaction.
HealthyFoodStreetsellers,particularlyindevelopingcountries,supplylargeamountsoffood(51)peopleonlowincomes.Thi
Butintheendheapprovedofourproposal.
Inthe1ststudy,studentswhostayuplate______.Thepassageindicatesthatchronotherapycanbeusedtohelppeopleto______
Adentistmaydecidetoextractthetoothtopreventrecurrenttrouble.
ArtificialSpeechBecausespeechisthemostconvenientformofcommunication,inthefuturewewantessentiallynaturalcon
Weshallkeepthemoneyinasecureplace.
随机试题
下列选项中适合于真核RNA聚合酶Ⅰ的是
中年男性,突发恶心,头晕,呕新鲜血1000ml,出虚汗,无腹痛,查体:BPlO/8kPa,巩膜无黄染,心率120次/分,腹软,无压痛,肝脾未触及最可能的诊断是
最简单而快速的诊断输血中出现的细菌污染反应的方法是
下列有关社会影响评价的说法中,错误的是()。
()是指计算机系统中具有记忆能力的部件,用来存放程序和数据。
下列不是竣工决算与竣工结算的区别的是()。
根据企业所得税法律制度的规定,纳税人应当自年度终了后一定期限内向税务机关报送年度企业所得税纳税申报表,并汇算清缴,结清应缴应退税款。该期限是()。
当今社会上的诈骗案件,特别是诱之以利的手法(例如:抽中大奖,但须先付税金),有很大的比例都以高龄者为目标。老人很容易成为诈骗受害者,且这种现象在世界各地都极为普遍。经过调查研究,心理学家认为,这是因为老年人更容易相信别人。年龄的增长与其对他人的信任程度成正
请认真阅读下列材料,并按要求作答。动作方法:①从跪立开始,上体前倾,同时两臂后摆,臀部后坐。②两臂迅速向前上摆,摆至前举时立即制动,同时伸腰展髋,脚背与小腿用力下压。③身体向上腾起时,迅速提膝收腿成半蹲姿势。保护与帮助:保护帮助者站在练习者体侧,当其
【2014.山东淄博】在教育统计分析中,标准差和全距属于()。
最新回复
(
0
)