Esuit missionaries visiting the region in 1654 were the first to report salty brine springs around the southern end of "Salt Lake," known today as Onondaga Lake.
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(This is from Wikipedia)
Humans took seeds from wild plants and grew them close to their homes, and the very early farmers observed that some plants had more favorable characteristics than others, such as better-tasting or more numerous or retained seeds, or were easier to grow, or were more vigorous.
"Mount Vaals is a hill 322.7 m in height, the highest point in the Netherlands. It is located in the province of Limburg."
Gasoline, smoke from factories, oil