Text from youtube "The world uses 40 billion tonnes of sand each year to build cities and towns, but global reserves are running low. We find out why."
license
Where the stuff on this blog is something i created it is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License so there are no requirements to attribute - but if you want to mention me as the source that would be nice :¬)
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