首页
登录
职称英语
Icebergs are among nature’s most spectacular creations, and yet most people
Icebergs are among nature’s most spectacular creations, and yet most people
游客
2024-06-18
34
管理
问题
Icebergs are among nature’s most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them. They come into being—somewhere—in faraway, frigid waters, a- mid thunderous noise and splashing turbulence, which in most cases no one hears or sees. They exist only a short time and then slowly waste away just as unnoticed.
Objects of sheerest beauty, they have been called. Appearing in an endless variety of shapes, they may be dazzlingly white, or they may be glassy blue, green or purple, tinted faintly or in darker hues. They are graceful, stately, inspiring in calm, sunlit seas.
But they are also called frightening and dangerous, and that they are in the night, in the fog, and in storms. Even in clear weather one is wise to stay a safe distance away from them. Most of their bulk is hidden below the water, so their underwater parts may extend out far beyond the visible top. Also, they may roll over unexpectedly, churning the waters around them.
Icebergs are parts of glaciers that break off, drift into the water, float about awhile, and finally melt. Icebergs afloat today are made of snowflakes that have fallen over long ages of time. They embody snows that drifted down hundreds, or many thousands, or in some cases maybe a million years ago. The snows fell in polar regions and on cold mountains, where they melted only a little or not at all, and so collected to great depths over the years and centuries.
As each year’s snow accumulation lay on the surface, evaporation and melting caused the snow- flakes slowly to lose their feathery points and become tiny grains of ice. When new snow fell on top of the old, it too turned to icy grains. So blankets of snow and ice grains mounted layer upon layer and were of such great thickness that the weight of the upper layers compressed the lower ones. With time and pressure from above, the many small ice grains joined and changed to larger crystals, and eventually the deeper crystals merged into a solid mass of ice.
选项
答案
the nature and origin of icebergs
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3639590.html
相关试题推荐
Itisclearthatsomepeoplewhoparticipateinexercisetrainingwilldevel
Itisclearthatsomepeoplewhoparticipateinexercisetrainingwilldevel
Itisclearthatsomepeoplewhoparticipateinexercisetrainingwilldevel
Peoplewerenotfullyawarethatpeaceofmindwasveryimportantforhealth.A、人
Somepeoplearguethatself-plagiarism(自我剽窃)isimpossiblebydefinitionbeca
Somepeoplearguethatself-plagiarism(自我剽窃)isimpossiblebydefinitionbeca
AnewpollshowsthatpeoplebelievethatcomputersandtheInternethavema
Theprojectisdesignedtoprovideyoungpeople______work.A、toB、forC、inD、with
Ithasbeenfoundthatsomepeopledevotethemselvessofullytotheirbusiness
MostofthepeoplewhoarevisitingBritain_____aboutthefoodandweatherthe
随机试题
Completetheformbelow.WriteONEWORDAND/ORANUMBERforeachanswer.[img]20
Sheremainsconfidentand______untroubledbyourpresentproblems.A、indefinitel
Justasabookoftenjudged________bythequalityandappearanceofitscover,
Unlessmeasuresaretakenatonce,thereisapossibilitythatalltheocean
干式报警阀应()至少进行一次报警阀正确运行验证试验。A.每月 B.每季度
下列说法正确的是()。A.增大反应物浓度,平衡正向移动,反应物的转化率一定增大
”U”螺栓应在钢丝绳的尾端(短绳一侧),不得正反交错。绳卡初次固定后,应待钢丝绳
某运输企业于2016年年初投资3000万元购买一台设备,预计使用期限为10年,年
不易使药材发生霉变的成分是A:蛋白质B:淀粉C:树脂D:糖类E:黏液质
在鲜花盛开、草木葱茏的阳春三月,人们常有“花在微笑、草在点头”的愉悦。这种情绪状
最新回复
(
0
)