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Rivers flow downhill until they reach the sea.

Rivers flow downhill until they reach the sea.

Water always runs from high places to low places. Little streams join together to make big rivers on the way.

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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. 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. The Pacific is the biggest ocean on our whole planet. The Pacific is the biggest ocean on our whole planet.