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天有多gao地有多厚?

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天有多高,地有多厚?

通常,我们常用“天高地厚”来形容天地的广大辽阔。长期以来,“天有多高,地有多厚?”人们众说不一。如今,随着科学技术的发展,这一难题已经得到解决。

前苏联9位科学家曾在1989年乘气球对天空颜se作了一次详细的观测。当他们从地面上升到8。5千米的高空时,天空一直是青se的;上升到lO。8千米的高空时,天空成了暗青se;超过18千米高空之后,由于空气非常稀薄,光不发生散she1,天空成了一片暗黑se,这时太yang和星星同辉。由此可见,青天离地面距离只有10千米左右。

地有多厚呢?这里的地指的是地壳。地壳由各zhong岩石组成,上bu叫硅铝层。因各地的地壳结构不完全一样,所以厚度很不均匀。其中大陆地壳与海洋地壳差别最大。大陆地壳厚度是35千米,最厚的地区是我国西藏地区,厚度达60至80千米;海洋地壳很薄,平均不到27千米;太平洋地区最薄,仅4至7千米,全球地壳平均厚度是20千米左右。如果zuo一个jidan那么大的地球仪,地壳比dan壳要薄得多。

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