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
Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typically destroy ice fields, as they did in
Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typically destroy ice fields, as they did in
admin
2012-03-21
69
问题
Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typically destroy ice fields, as they did in 1980 when 70 of Mount Saint Helens ice cover was demolished. During long dormant intervals, glaciers gain the upper hand cutting deeply into volcanic cones and eventually reducing them to rubble. Only rarely do these competing forces of heat and cold operate in perfect balance to create a phenomenon such as the steam caves at Mount Rainier National Park.
Located inside Rainier’s two ice filled summit craters, these caves form a labyrinth of tunnels and vaulted chambers about one and one half miles in total length. Their creation depends on an unusual combination of factors that nature almost never brings together in one place. The cave making recipe calls for a steady emission of volcanic gas and heat, a heavy annual snowfall at an elevation high enough to keep it from melting during the summer, and a bowl shaped crater to hold the snow.
Snow accumulating yearly in Rainier’s summit craters is compacted and compressed into a dense form of ice called firm, a substance midway between ordinary ice and the denser crystalline ice that makes up glaciers. Heat rising from numerous openings (called fumaroles) along the inner crater walls melts out chambers between the rocky walls and the overlying ice pack. Circulating currents of warm air then melt additional openings in the firm ice, eventually connecting the individual chambers and, in the larger of Rainier’s the crater’s, forming a continuous passageway the extends two thirds of the Way around the crater’s interior.
To maintain the cave system, the elements of fire under ice must remain in equilibrium, enough snow must fill the crater each year to replace that melted from below. If too much volcanic heat is discharged, the crater’s ice pack will melt away entirely and the caves will vanish along with the snows of yesteryear. If too little heat is produced, the ice, replenished annually by winter snowstorms, will expand, pushing against the enclosing crater walls and smothering the present caverns in solid firm ice.
According to the passage, heat from Mount Rainier’s summit craters rises from_____.
选项
A、crystalline ice
B、firms
C、chambers
D、fumaroles
答案
D
解析
细节理解题。见第三段中“eat rising from numerous openings(called fumaroles)”。
转载请注明原文地址:https://www.kaotiyun.com/show/5smK777K
0
专业英语四级
相关试题推荐
WhatisIsraelprobablytodoifPalestiniansattackitssoldiersduringthepullout?
Primaryschoolteachers’poor【C1】______ofEnglishandmathsisunderminingtheGovernment’sliteracyandnumeracystrategies,
ThepollutionquestionaswellasseveralotherissuesisgoingtobediscussedwhentheCongressisin______againnextspring.
Thecrisishas【C1】______questionsaboutthelargeoilcompaniesandwindfallprofits.Criticsoftheoilindustry【C2】______
Bush’sofferinghelpforthesurvivorsoftheearthquakeinIran______.
Moderntechnologyandsciencehaveproducedawealthofnewmaterialsandnewwaysofusingoldmaterials.Fortheartistthism
All______atthepresenttimeisanurgentand.rationaldecisionotherthanendlessdispute.
HewasthesilentofthestormthateruptedaftertheviolentdeathofDiana,PrincessofWales.Theonlysurvivorofthehorrif
Mr.Linadvisedmetokeepsilent______.
Poortransportfacilitiesandthelackofresources,rawmaterialsandenergyalsopartly______thedropincontractfulfillment
随机试题
下列元素中,_______不属于必需微量元素。
A、格列本脲B、普通胰岛素C、阿卡波糖D、二甲双胍E、罗格列酮能增加胰岛素受体敏感性的药物是
A.指关节梭状畸形B.杵状指C.匙状甲D.浮髌现象E.肢端肥大类风湿关节炎,常表现为
()模块的主要功能是对软件的各个子系统进行统一的操作管理和数据维护。
教学技能属于()。
历年的黄金周社会各方面都会呈现火爆态势,尤其是在经济方面体现得最为突出,而到黄金周结束后则会出现一个明显的回落,因此有很多人认为黄金周是造成随后月份经济疲软的一大诱因。如果以下各项为真,最能质疑上述观点的是:
《马斯特里赫特条约》
阅读下列材料,回答问题:方里而井,井九百亩,其中为公田。八家皆私百亩,同养公田。公事毕,然后敢治私事。(《孟子.滕文公上》)乃经土地而井牧其田野,九夫为井,四井为邑,四邑为丘,四丘为甸,四甸为县,四县为都,以任地事而令贡赋。(《周礼.地
在设计程序时,应采纳的原则之一是
设计下列4行4列的表格,各列的宽度为4厘米,行高为25磅,按表格内容填入相应的数据。字体设置成Arial,字号设置成五号,字体格式设置成加粗、倾斜、加下划线,并以WD10B.DOC为文件名保存在指定文件夹中。
最新回复
(
0
)