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Water surrounds us, falling from the sky, rushing down Niagara Falls, pouring from faucets, and yet many of us never ask where it comes from. The answer stretches way back -- before tides and thunderclouds to the big bang.
Without water, Earth would be a barren and lifeless planet. But did you know the Earth's water supply has not increased or decreased for billions of years? No wonder hydrologists are so fascinated by water.