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
2
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] How can we account for the formation of an iceberg?
选项
答案
The result of accumulation of snowflakes.
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3629862.html
相关试题推荐
AccordingtoWorldHealthOrganization,howmanypeoplearekilledbyoutdoorai
AccordingtoWorldHealthOrganization,howmanypeoplearekilledbyoutdoorai
AccordingtoWorldHealthOrganization,howmanypeoplearekilledbyoutdoorai
AccordingtoWorldHealthOrganization,howmanypeoplearekilledbyoutdoorai
AccordingtoWorldHealthOrganization,howmanypeoplearekilledbyoutdoorai
Revengeisoneofthosethingsthateveryoneenjoys.Peopledon’tliketotal
Somepeoplehavetheage-olddesiretoputthejokeonothers.[br]Thecropcir
Somepeoplehavetheage-olddesiretoputthejokeonothers.[br]Traditional
Somepeoplehavetheage-olddesiretoputthejokeonothers.[br]Dihydrogenm
Somepeoplehavetheage-olddesiretoputthejokeonothers.[br]Accordingto
随机试题
钟医生:“通常,医学研究的重要成果在杂志发表之前需要经过匿名评审,这需要耗费不少
下列哪项应在-5℃~35℃的气温条件下进行防水层的施工?( )A.高聚物改性沥
女,27岁。GP,平时月经规律,停经40天,右下腹剧痛4小时伴头晕、肛门坠胀感。
下列药物,长期应用易使血钾升高的是()A.呋塞米 B.氢氯噻嗪 C.螺
A.枇杷叶B.狗脊C.金樱子D.骨碎补E.鹿茸需“燎去毛”的药物是
上层建筑是适应经济基础的要求而产生的,但作为一种超经济的力量,上层建筑又具有相对
企业某年的税前净利润为9000万元,利息费用为3000万元,则其利息保障倍数为(
下列不属于调耠原则的是A.应分次完成 B.调牙合时,随时检查咬合关系 C.选
水利工程土石围堰漏洞险情进水口的探测方法有( )等。A.水面观察 B.潜水探漏
关于开标的说法,正确的是( )。A.投标文件经确定无误后,由招标监管部门人员当
最新回复
(
0
)