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Sometimes the sky is full of white clouds. But sometimes clouds look black. Where does the colour come from?

Clouds are made of water or ice. But the drops of water in the clouds are not red or orange. The sun makes the colours in the clouds. Sunshine changes colour as it goes through the drops of water in the clouds.

Clouds look dark because they are so thick. Lots of drops of water make a cloud. Very little sunshine can go through. Dust also makes clouds dark. Dust from the ground is blown into the sky. and becomes part of the clouds.

The colours of the clouds tell about the wether.

【參考譯文】

有時天空布滿了白云，可是有時云看起來是黑的。這些顏色是從哪里來的呢?

云是由水和冰組成的。可是云中的水滴冰不是紅色或橘黃的。太陽使云有了顏色。當(dāng)陽光穿過云中的水滴是改變了顏色。

云看起來暗是因為云層太厚了。許多水滴組成了云，很少的陽光能穿透云層。塵埃也能是云變暗。地面上的塵埃被吹到空中時，它就成了云的一部分。通過云彩的顏色能預(yù)報天氣。