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Super science

We are running out of sand

作者:teens
Aa
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地球上的沙子就快要被耗尽了

Where can you find sand? You can find it in deserts (沙漠), beaches and playgrounds. But did you know that sand is useful? It is the second most-used resource (资源) in the world after water. But we are using sand too fast. One day, we may have no sand left to use.
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