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Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go in a hurry. The water in the apple you ate yesterday may have fallen as rain half-way around the world last year or could have been used 100 million years ago by Mama Dinosaur to give her baby a bath. jksda;fjksd;fjdsajf -
1voteThe Earth?s climate changes in response to external forcing, including variations in its orbit around the Sun (orbital forcing),[14][15][16], changes in solar luminosity, volcanic eruptions,[17]
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