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
2024-06-11
59
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, amid 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 (ff 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 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. [br] The icebergs are rarely seen because ______.
选项
答案
they are located in remote regions of the world
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3629860.html
相关试题推荐
Mostpeoplewouldbe【S1】bythehighqualityofmedicine【S2】tomostAmeric
[audioFiles]audio_eusm_j01_127(20099)[/audioFiles]A、Howprimitivepeopleusedf
Themorepeopleyourchildencounters,_____________________________(他越有可能遇上喜欢他
[originaltext]Thehomeisthecentralfocusofmostyoungpeople’slivesin
[originaltext]Thehomeisthecentralfocusofmostyoungpeople’slivesin
[originaltext]Thehomeisthecentralfocusofmostyoungpeople’slivesin
Theauthorthinksthatpeopleare______.[br]Present-daysocietyismuchfreer
Mostpeopledon’tenjoyfacingthedifficultsituationsthatsometimesoccur
[originaltext]TherearepeopleinItalywhocan’tstandsoccer.NotallCana
[originaltext]TherearepeopleinItalywhocan’tstandsoccer.NotallCana
随机试题
Peopleenjoytakingtrips.Butwhatarethereasonstheyleavehome?Onereas
HenryIIIdidn’tknowmuchaboutbiology.Hewentthroughsixwivesbackin
When,accordingtoMrs.Hammer,isthephoneinterviewlikelytotakeplace?[or
ThesymptomsofAlzheimer’sdiseasewerelongdismissedasnormalconsequenc
原核生物中具有延伸功能的RNA聚合酶是_______
A.解旋酶 B.引物酶 C.DNA聚合酶 D.DNA连接酶 E.拓扑异构
下列可能引起的肾损害的药物中,可导致"不可逆性肾小管坏死"的是A.顺铂 B.庆
某男,56岁,患高血压病服用吲达帕胺,后因血压控制不理想,自行加服珍菊降压片。近
(2018年真题)患者,女35岁,癫痫病史10年。在工作时突然跌倒在地,口吐白沫
下列不属于卫星通信缺点的是()。A.通信频带宽 B.存在回波干扰 C.保密
最新回复
(
0
)