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According to Chris Ralph from mindlab, you should go for these signs: Color Changes: In many districts, acidic mineral solutions have bleached the area rocks to a lighter color. This can be...
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#1: Attribution notice removed
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System
·
2020-10-27T17:18:41Z (about 4 years ago)
Source: https://outdoors.stackexchange.com/a/12977 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/