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.

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有時(shí)天空布滿了白云，可是有時(shí)云看起來(lái)是黑的。這些顏色是從哪里來(lái)的呢?

云是由水和冰組成的?？墒窃浦械乃伪皇羌t色或橘黃的。太陽(yáng)使云有了顏色。當(dāng)陽(yáng)光穿過(guò)云中的水滴是改變了顏色。

云看起來(lái)暗是因?yàn)樵茖犹窳?。許多水滴組成了云，很少的陽(yáng)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(shí)，它就成了云的一部分。通過(guò)云彩的顏色能預(yù)報(bào)天氣。