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#35: Is The World Really Running Out Of Sand?

English Learning for Curious Minds

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The Key Vocabulary Explains Tough Words and Phrases

After air and water, sand is the third most used natural resource. It forms 80% of concrete and 94% of asphalt. A typical American house requires more than 100 tons of sand to build it. The key vocabulary explains tricky words so you don't have to look things up in a dictionary.

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