Page 31 - The Periodic Table Book

The salt forms part of rocks deep underground before ancient seas drying out. Over millions of years, that
it is dissolved by the stream and flows into the pools. dry salt has become buried under dense layers of rocks.
Evaporation can also be used to collect salt from seawater This so-called “rock salt” is sometimes unearthed using
or other salty water sources (known as brines). Today, excavators. At other mines, it is washed out by piping in
however, most of the world’s salt comes from underground warm water, which dissolves the salt. The brine is then
mines containing thick layers of salt that are a result of pumped up to the surface for evaporation.

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