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
Mount Rainier, the highest mountain in Washington State, reaches to more than 14 410 feet (4 392 meters) above sea level. Though
Mount Rainier, the highest mountain in Washington State, reaches to more than 14 410 feet (4 392 meters) above sea level. Though
admin
2012-01-14
45
问题
Mount Rainier, the highest mountain in Washington State, reaches to more than 14 410 feet (4 392 meters) above sea level. Though it is a dormant volcano (having last erupted 150 years ago) encased in over 35 square miles of snow and ice. steam vents in the summit craters suggest the volcano is not extinct. Even though it was built up to its towering height above the surrounding country by repeated eruptions and successive flows of hot lava, it is the slow and unstoppable power of glacial ice that is now reshaping it.
Glaciers are essentially accumulations of snow that has not melted from year to year. As the snow accumulates, its weight presses the air out from between the crystals and packs the snow down tight, compressing it to a sponge-like, porous ice called firn or neve. Each year as a new layer of snow is added, the lower layers are compressed more and more, becoming harder and harder until finally the lower layers become as hard as ordinary ice. Then gravity pulls the ice down the mountainside, both scouring and smoothing the bedrock underneath it as it moves. The seasonal freezing and thawing breaks rocks from adjacent slopes, which then fail onto the glacier’s surface. The passing ice carries the debris away. Thus, what has been created by fire is destroyed by ice.
A particularly amazing feature of Mount Rainier is the ice caves that are scattered along its flanks. They are formed when small grottos are melted out along the sides of the glacier. Rainier’s two ice-filled summit craters each support a network of ice caves which arc carved by heat and volcanic emissions from deep inside the mountain. This happens when the firn ice created from the continual accumulation of snow in the summit craters starts to melt from the heat that rises along the crater walls of the volcano. The currents of warm air melt chambers between the rock walls of the mountain and the firn ice. As the process continues, a complex network —a maze -of large caves and tunnels is created throughout the interior of the crater.
This whole process depends on maintaining a rather delicate balance. In order for the process to continue, enough snow must fall each year to fill the craters and replace the ice that has melted underneath. But, if too little heat is emitted, and the snow steadily accumulates, then the ice will expand, pushing itself against the crater walls and filling the caverns with ice. On the other hand, if more steam is emitted than the amount of firn created, the ice pack will melt away, destroying the ice caves. It is in this manner that Mount Rainier s huge Paradise Ice Caves melted away in the 19th century. (459 words)
What does "glacier"(Line 1, Para. 2) mean?
选项
A、The summit of a mountain.
B、A stream of water melting from ice.
C、Mass of ice formed by snow.
D、The ice cave.
答案
C
解析
参考第二段第一句,冰川是常年积雪形成的。
转载请注明原文地址:https://kaotiyun.com/show/Fi6O777K
0
考博英语
相关试题推荐
Notuntiltheadventofhistochemistrycouldtheanatomistseethroughthemicroscopewhichcellscarryspecificenzymesorgaug
Whatdoconsumersreallywant?That’saquestionmarketresearcherswouldlovetoanswer.Butsincepeopledon’talwayssaywhat
ManypeopleinvestinthestockmarkethopingtofindthenextMicrosoftandDell.However,Iknow【21】personalexperiencehowdi
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,theCrimeandJusticenetworksponsoredaforumonth
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitudes.Emotionalreactionsaswellaslogicalthought
Some(research)suggests(what)thereisa(linkbetween)thebody’scalciumbalance(and)toothdecay.
Superstitionisadifficultquestion.WecannotquitesaythatsuperstitioninBritainisdead.Itshistoryisboth【76】longand
BritainoccupiedJavaduringtheNapoleonicWars.BoththeBritishandlatertheDutchtriedtocentralizeandreformJava’sadm
Aknowledgeofhistory______ustodealwiththevastrangeofproblemsconfrontingthecontemporaryworld.
Intoday’srapidlychangingeconomy,opportunities______forthosewhoaremotivatedanddedicatedtoachievingtheircareergo
随机试题
气体扩散速率与()
以下不属得神表现的为
下利不属于复发的常见诱因的是
外感风寒或风热之邪,或痰湿壅肺,肺失宣肃,导致的音哑或失音,称为()
对建筑内部装修工程进行防火检查时,应注意检查装修施工单位遵守有关规定的情况,根据现行国家消防技术标准,下列规定中,属于施工单位应当遵守的有()。
对金融机构以及其他单位和个人的(),银监会有权进行检查监督。
甲乙等六位股东各出资50万元于2015年2月设立一有限责任公司,五年来公司效益一直不错,但为了扩大再生产一直未向股东分配利润。2021年股东会上,乙提议进行利润分配,但股东会仍然作出不分配利润的决议。对此,乙的救济方式是()。
主存用来存放()。
注意事项1.本题本由给定资料与作答要求两部分构成,考试时限为150分钟。其中,阅读给定资料参考时限为40分钟,作答参考时限为110分钟。2.请在题本、答题卡指定位置上用黑色字迹的钢笔或签字笔填写自己的姓名和准考证号,并用2B铅笔在准考证号对应的数字上填
GesturesI.Universalusageofgesturesincommunication1)GesturesarewidelyusedespeciallyinArabcountries.2)Gesturesh
最新回复
(
0
)