Chan-Seung Lee
Joined: 03 Dec 2005 Posts: 1032
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Posted: Sun Oct 11, 2009 11:16 pm Post subject: ground |
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| Why is the sky blue? Without the air, it might be black. As sunlight comes to the earth, it bumps into the tiny molecules and dust in the air. When light hits a gas molecule, it may bounce off in a different direction. Some colors of light, like red and orange, pass straight through the air. But most of the blue light bounces off in all directions. In this way, the blue light gets scattered all ground the sky. So, when you look up, some of blue light reaches your eyes from all over the sky, and it looks blue. |
I cannot understand 'the blue light gets scattered all ground the sky.'
Especially the word 'ground' makes me confused.
In this sentence, what does 'ground' mean?
Thanks. |
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