None of the Above (![[info]](http://klab.lv/img/userinfo.gif){kind=small} artis) rakstīja,@ 2017-11-24 09:33:00 |
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TIL
"All the major building materials- concrete, bricks-are made using sand. That makes it second most used natural commodity after water. More than 40 billion tons of sand and gravel are used every year. Mining of sand is a $70 billion industry"
"All the major building materials- concrete, bricks-are made using sand. That makes it second most used natural commodity after water. More than 40 billion tons of sand and gravel are used every year. Mining of sand is a $70 billion industry"
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