今天做了一道题,是这样写的21.Global warming causes sea-level rises by...a:increase ocean temperature,resulting in expansion of ocean volumeb:melting floating sea-ice at Arctic Ocean,resulting in increase in the total amount of water in oceanc:melting of glacier at high mountain and at Antarctic and Greenland,resulting in increase in the total amount of water in ocean.答案是选a和c,但我总觉得b也没有错啊,可能是不是怀疑会不会增加水的总量,但我又觉得没有问题.既然c对了,b也对啊...疑惑中...
今天做了一道题,是这样写的
21.Global warming causes sea-level rises by...
a:increase ocean temperature,resulting in expansion of ocean volume
b:melting floating sea-ice at Arctic Ocean,resulting in increase in the total amount of water in ocean
c:melting of glacier at high mountain and at Antarctic and Greenland,resulting in increase in the total amount of water in ocean.
答案是选a和c,但我总觉得b也没有错啊,可能是不是怀疑会不会增加水的总量,但我又觉得没有问题.既然c对了,b也对啊...疑惑中...
同质量的冰的体积比水的要大，floating sea-ice是伏在水里的冰，化掉后变成水体积会缩小，不会引起sea-level rise的
假如没有c选项,选b也是对的。显然c比b更全面，所以为了不重复选项，就在bc之间选了个最佳答案c
B.选项不对,它说的是融化浮冰会使海水上升.这个影响不大呀!主要指的是冰山的融化吧!
A.C.选项合理
A.中说的是温度上升,这是一定会使冰山融化的.（合理）
B.中说的是海面上的浮冰融化会使海水上升.（浮冰本身就对海水有压力,融化后对海水上升影响不大）
C.中说的是高山和岛屿上的冰川融化.（合理）
The melting of floating ice will not change sea level: the mass of this ice is equal to that of the water it displaces (watch the water level in a cup of floating ice cubes as they melt). For comparison, globally ice (both grounded and floating) represents about 2% of the world's water, with about 1,350,000,000 km3 of water in the oceans.
明白了不？总量不变，浮冰的体积已经对海平面影响过了。即使熔化，海平面并不上升。它就是这么算的啊，你可以去google搜下这篇文章。
还有，这算生物么。。。
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好吧，既然有人谈到体积了，那我再说精确点。。。
ρ冰V冰g=ρ水V1g（有关浮力的阿基米德定理，占用水的体积等于自身重力）
ρ水V2=ρ冰V冰（对于浮冰，熔化前后质量不变）
得V1=V2，也就是浮冰占用海水体积不变。