Except...
...Except where plants have composted, and then dehydrated, all their plant-selected (balanced, for living things) minerals, for hundreds of millions of years.
Hundreds of millions of years guarantees us that there are no man-made chemicals in the stuff.
Besides, it takes a long, long time to dry up a section of the ocean, and turn the deposit into a rock-like substance.
2/3 to 3/4 of this planet's surface is water...and then, a lot of it is pretty deep...pretty deep in comparison to the mountains the shifting earth shoves skyward.
The highlands then form 'puddles', of various sizes, of ocean water...except that the puddles leak...just as does your palm, when you scoop a handful of water.
"But," says you..."Ocean water is 'salty', and streams and rivers aren't. So where do all the mineral 'salts' go...tell me THAT?!"
"Absolutely!" says I.
...Back into the soil, and, eventually, rock...all that doesn't race back into the oceans...much of it to only sink to the ocean floor, get covered with silt, and become rock once more.
However, that was a long time ago, and what does it matter to us, today?
Well, with the ebb and flow of evaporation, rain, the actions of countless soil micro organisms, and gravity...plant-selected, and balanced for living things, mineral salts accumulate in 'pockets', become a type of rock, and wait to be recycled back into the system once more.
...Simply add enough water.
TO BE CONTINUED...