in the beginning, there was one large continent called pangea and as that continent broke apart and the tectonic plate carried land masses around the planet. the places we now hind salt where under water
*cough* gondwanaland *cough*
where's carl sagan when you need him? that guy...
salt kills the fertility of the land , just look at verges where the salt from the roads has splashed up in winter , the grass dies off.