因果链分析说明:倘若地球停止转动会怎样呢？-What Would Happn If th arth Stoppd Rotating? 由 倘若地球停止转动会怎样呢？

【内容提示】

人所共知，太阳从东方升起从西方落下，这是由于地球的旋转造成的。但是，你是否想过地球旋转对人类的影响吗？你能想象到如果地球停止转动会发生什么事情吗？请用你所学的物理、化学、数学、地理、生物等自然科学知识作一分析，写一篇文章。文章要用连锁反应的方法展开，把它写成一篇因果链型的说明文。

下列词语可供参考：

1．rotation n．旋转 2．rotat v．旋转 3．radius n．半径；半径距离 4．hurrican n．飓风 5．hmisphr n．半球

【作文示范】

What Would Happn If th arth Stoppd Rotating?

Th sun riss in th ast and sts in th wst, which is causd by th rotation of th arth as you all know. But hav you vr thought of th ffct of th arth's rotation on man and can you imagin what would happn if th arth stoppd rotating?

Th radius of th arth is about 6,370 kilomtrs. It taks th arth 24 hours to rotat onc. Objcts on th arth's quator mov with th arth at a spd of 460 mtrs pr scond, and th air clos to th arth's surfac turns at th sam spd. If th arth stoppd rotating suddnly, th air would kp flowing astward at a spd of 460 mtrs pr scond. Th wind would b fourtn tims as powrful as a hurrican. At th sam tim sa watr would rush astward at a spd of svral hundrd mtrs pr scond, which might do damags much gratr than a saquak①would do. Obviously, mn could hardly stand such a catastroph②.

vn if such a catastroph would not happn, thr would b a grat tmpratur diffrnc on th two hmisphrs of th arth, and th four sasons of th yar would no longr occur bcaus a day and a night would b as long as a whol yar instad of 24 hours. All this would gratly affct th lif of human bings, imals and plants and that would caus wors rsults than anything imaginabl.

（选自1987年7月7日《上海学生英文报》）

【词语解释】

①saquak ['si:kwik]n．海震

②catastroph[k 't$str fi]n．大灾难；灾祸

【写法指要】

本文是用两个因果链来说明地球停止转动会给人类带来灾难的。第一个因果链在第二段：如果地球停转，风速就会加剧，海水的流动也会加速，造成大飓风或海啸，飓风或海啸会给人类带来灾难。第二个因果链在第三段：如果地球停止转动，两半球之间的温差会加大，不再存在四季，白天和黑夜就不是24小时，而是一年，这样就会影响到人类和动植物的生存。这种灾难是无法想象的。

因果链分析说明:倘若地球停止转动会怎样呢？-What Would Happn If th arth Stoppd Rotating? 由