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How Much Water Is on Earth?

science.howstuffworks.com/environmental/earth/geophysics/question157.htm

Water is one of the most abundant substances on the planet. About 70 percent of our planet is covered by oceans, but just how much water is there on Earth?

The Ancient Civilizations Quiz

play.howstuffworks.com/quiz/the-ancient-civilizations-quiz

It's time to take a trip back in time to some of the first civilizations to live on the planet. Do you think you could have lived along with them? Take the quiz to find out!

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