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.
中考临近,我和同窗好友被派到新加坡去体验生活,一周后,便要!厚厚的资料夹,翻烂的日记本,250毫升盒装纯牛奶,这些点点滴滴构筑了一周的色彩。临走前一晚,隔壁的好友走出来,门把手有了轻微的转动,一阵脚步声、门、开了。风扇还在咔咔作响。可能是怕风扇声影响到我吧,好友轻轻地把它关掉。一声咯吱,我抬起头,眼神里充满了疑惑。“我复习的差不多了,来看看你。”她莞尔一笑,慢慢地走过来,顺手拿起一把蒲扇,一下、两下、轻轻地、为我扇了起来。微风拂面,一阵惬意,吹进了心中。仿佛一股蓄势已久的浪潮,翻涌开来!
多少同窗旧事,只因那把轻轻扇动的蒲扇,笑面困境!
花开花落,一朵丁香,让我懂得同窗情谊的真谛;微风阵阵,一把蒲扇,让我因同窗而不再孤独!
追忆一把似水流年,疾笔间,体味往事的香甜;享受一次同窗旧事,忙碌中,回味友情的余香。不是只有两件,才能打动人心,只要细心品读,旧事也很美好!
梦里花落知多少,同窗旧事知多少。回忆一种、满满温情!
清晨,太阳的光辉,向我微笑。远处传来一阵脚步声,我回头,是朋友在向我招手。晶莹的汗珠从她的脸上划过一道完美的弧线。肩并肩,我们一同来到前方的丁香树下。朋友曾对我说,这里是幸运的五瓣丁香。抬起头,伸出手,我们各自拿来属于自己的“幸运”!我看她的嘴角微微上扬。“你说,这真的.能给人带来好运吗?”“其实这只是一个传说,心态好,它就在你的心中!”神秘的话语,让我仿佛看到紫雾环绕。我把花朵紧紧合在手心,偶尔,几片随风飘下,一开一合,仿佛为友谊欢舞!
多少同窗旧事,只因本中的那朵丁香,笑看人生!
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