Answers

2015-07-25T11:47:50+05:30
It's due to scattering of light since our earth contains almost 70% of water, when sunlight goes through our earths atmosphere, the water starts absorbing the red light in this way water also enhances the scattering of blue light in its environment. 
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2015-07-25T11:58:36+05:30
Because 2/3 rd of the earth is covered by water so it is often called blue green planet 
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