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Water is the only thing on Earth found naturally as a solid, a liquid, and a gas.

Water is the only thing on Earth found naturally as a solid, a liquid, and a gas.

You can spot all three in everyday nature: ice (solid), rain or the sea (liquid), and invisible water vapour or clouds (gas). Most other substances need extreme temperatures to switch states like that.

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Most of the Earth is covered by water. Most of the Earth is covered by water. Rain comes from water that rises into clouds and falls back down. Rain comes from water that rises into clouds and falls back down. Rivers flow downhill until they reach the sea. Rivers flow downhill until they reach the sea. Ocean water tastes salty, but rain and rivers are fresh. Ocean water tastes salty, but rain and rivers are fresh. Ice is simply water that has frozen hard and cold. Ice is simply water that has frozen hard and cold.