MCQ
Earth appear blue from sky due to presence of:
- ADesert
- BMountains
- CLand
- ✓Water
The Earth has been blue for over $4$ billion years because of the liquid water on its surface.
There is only one known planet with permanent bodies of liquid water at its surface: ours.
Earth sciences allow us to explain why the Earth has almost always been blue: it's neither too warm nor too cold.
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