the sun rises in the east and sets in the west, which is caused by the rotation of the earth as you all know. but have you ever thought of the effect of the earths rotation on man and can you imagine what would happen if the earth stopped rotating?
the radius of the earth is about 6,370 kilometres. it takes the earth 24 hours to rotate once. objects on the earths equator move with the earth at a speed of 460 metres per second, and the air close to the earths surface turns at the same speed. if the earth stopped rotating suddenly, the air would keep flowing eastward at a speed of 460 metres per second. the wind would be fourteen times as powerful as a hurricane. at the same time sea water would rush eastward at a speed of several hundred metres per second, which might do damages much greater than a seaquake would do. obviously, men could hardly stand such a catastrophe.
even if such a catastrophe would not happen, there would be a great temperature difference on the two hemispheres of the earth, and the four seasons of the year would no longer occur because a day and a night would be as long as a whole year instead of 24 hours. all this would greatly affect the life of human beings, imals and plants and that would cause worse results than anything imaginable.
在一个大树茂盛的美丽的大森林里生活着很多互相友好的小动物们。
有一天,忽然传来了大机器的声音,小动物们赶快向森林跑去,可是那个大机器伐树伐得太快啦,不一会儿就把森林的树伐的一颗不剩,全是树桩了,小动物们都没有了自己的家园,没有地方可以藏身了。
不久猎人来这儿打猎来了,,这儿一枪,那儿一枪打伤了很多动物,因为动物们都没有了藏身之地和他们美丽的'家园。
有一天,那个猎人又到这儿打猎来了,这次动物们早有准备了,这个猎人一来动物们就从各处走过来把猎人围在了里面,猎人一看这么多的动物吓得连枪都不敢开了。
这时,这些动物你一言我一语的说开了:“你为什么要来打我们?”“对呀!你看你打伤我们多少朋友!”“你把我们都打伤有什么好处吗?”“我们也没有打你,你为什么要不放过我们呢?”“你必须给我们再找一个家园。”“要不你把这片森林种好。”
猎人听了答应把这片森林种好,猎人和伐树工人一起种了一片美丽的森林,动物们又有自己美丽的新家了。
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