首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
Water The second most important constituent (构成成分)of the biosphere (生物圈)is...
Water The second most important constituent (构成成分)of the biosphere (生物圈)is...
admin
2020-12-24
36
问题
Water
The second most important constituent (构成成分)of the biosphere (生物圈)is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.
The earth’s supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form of the salt water of the oceans — about 97 percent. The rest is fresh, but three-quarters of this is in the form of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fraction, which is somewhat less than one percent of the whole, there is 10 ?20 times as much stored underground water as there is actually on the surface. There is also a tiny, but extremely important fraction of the water supply which is present as water vapour in the atmosphere.
Water vapour in the atmosphere is the channel through which the whole water circulation (循环)of the biosphere has to pass. Water evaporated (蒸发)from the surface of the oceans,from lakes and rivers and from moist (潮湿的) earth is added to it. From it the
water comes out again as rain or snow, falling on either the sea or the land. There is, as might be expected,a more intensive evaporation per unit area over the sea and oceans than over the land, but there is more rainfall over the land than over the oceans, and the balance
is restored by the runoff from the land in the form of rivers.
There is more rainfall
选项
A over the mountains than over the rivers.
B over the rivers than over the mountains.
C over the oceans than over the land.
D over the land than over the oceans.
答案
D
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/sdlQKKKQ
相关试题推荐
GoodTableManners Mannersplayanimportantpartinmakingafavorableimpr...
GoodTableManners Mannersplayanimportantpartinmakingafavorableimpr...
GoodTableManners Mannersplayanimportantpartinmakingafavorableimpr...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
RiseinNumberofCancerSurvivors Canceristhesecondleadingcauseofdea...
随机试题
冠内附着体义齿设计与制作的要点,错误的是 A.放置附着体的基牙冠修复后,为增加
关于序列拔牙错误的是
当断路器电源电压低于额定电压的30%时,并联分闸脱扣器不应脱扣。
设备缺陷的处理时限规定:严重缺陷处理不超过()。
患者男,60岁。因肝硬化并发上消化道出血,出现言语不清,举止反常,定向力和理解力
均衡国民收入等于()。 A.总供给B.总需求C.投资+储蓄D.消费
下列哪项与扁平苔藓的发病无关() A.免疫异常B.某些药物C.精神情绪因素D.创伤因素E.遗传因素
杜威的课程设计教学模式的结构是()。A.诱导学习动机→领会新教材→巩固知识→检查B.设置问题情境→确定问题或课题→拟定解决课颠方案→执行计划→总结与评价C
姚诸悦、唐佳琪、丁星或三人自主绪成合作小组,姚诸悦为组长。通过商量,三人决定搭游乐场中的旋转木马。 游戏开始,姚诸悦、唐佳琪、丁星或三人通过简短的商量...
男性,30岁,近5年腹泻,多次细菌培养阴性,结肠镜检查见直肠乙状结肠黏膜血管纹理模糊,黏膜细颗粒状,HB110g/L,下面哪项治疗是适当的 A禁食B...