When the weather is hot,you go to a lake or an ocean.阅读选择题答案

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查看11 | 回复2 | 2011-3-5 15:21:49 | 显示全部楼层 |阅读模式
When the weather is hot,you go to a lake or an ocean.When you are near a lake or an ocean,you feel cool.Why?The sun makes the earth hot,but it cannot make the water very hot.Although the air over the earth becomes hot,the air over the water stays cool.The hot air over the earth rises.Then the cool air over the water moves in and takes the place of the hot air.When you are near a lake or an ocean,you feel the cool air when it moves in.You feel the wind.And the wind makes you cool.
Of course,scientists cannot answer all of your questions.If we ask,“why is the ocean full of salt?”Scientists will say that the salt comes from rocks .When a rock gets very hot or very cold,it cracks.Rain falls into the cracks.The rain then carries the salt into the earth and then into the rivers.The rivers carry the salt into the ocean.But then we ask,“what happens to the salt in the ocean?The ocean does not get more salty every year.”Scientists are not sure about the answer to this question.

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千问 | 2011-3-5 15:21:49 | 显示全部楼层
当天起炎热的时候,你可以去湖边或者海边,当你接近那里的时候,感觉到了吗,很冷。为什么会有这种现象呢,因为当阳光是陆地变得很热的时候,它并不能使水变得同样热;尽管在地表面上的空气也变热了,水面上的空气还是保持着平衡的有些冷的温度;在地面上的热空气上升,然后水面上的冷空气取代了陆地上的热空气原有的位置,这样,当你靠近水域旁边的时候,你就会感觉有些凉,当然,这些是冷空气灌进来的结果,与之而来的是风,然后风的流动回事你更加感觉到冷。当然,科学家也不是万能到可以解决所有的问题,如果我们说:“为什么海水充满了盐分?”科学家会告诉你,盐分从岩石中来,当一块岩石遇到极冷或者极热的情况下石头会碎裂成石块,这时候雨水冲刷就会将盐分从岩石中带走进入大地,然后由河流流向大海。
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千问 | 2011-3-5 15:21:49 | 显示全部楼层
当天气炎热,你应去湖畔或者海边
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