Question

The appears blue when seen from the earth

Answer 1

The earth covered with water 71 percent ..So the earth appears blue when we see from the space..

Answer 2

The sky appears blue as when sunlight enters the earth's atmosphere is gets scattered From large no. Of molecules in atmosphere. Wavelength of blue colour is roughly half of wavelength of red colour therefore intensity of scattered blue light is about 2^4 times more than red. Thus sky appears blue