The main assessment for students is to take some examples of water from Devils Gully and the others from Red Well. Due to the oxidation of iron, which is contained in water in large amounts, an attractive red terrace in the form of a fan is created. Its water (pH 3.5) is less acid and has a lower general mineral concentration (4.372 mg/l of water). "Red Well" is another spring located downstream, in the alluvial plain, 400 m away from the first spring. In comparison to drinking water, it is 10 to 1000 times richer in minerals (aluminium, iron, potassium, copper, nickel, sulphur, and alaun). Another natural rarity in " Devil's Town" are two springs of extraordinary properties " Devil's Water", which is located in vicinity of these earthen figures, is a cold and extremely acid spring (pH 1.5) of high mineral concentration (15 g/l of water), springing out in " Devil's Gully". However, the material under the stone caps is protected from the "bombardment" of the rain drops and washout, and remains in place in the form of the rising earthen pillars - figures. The loose soil is dissolved and washed away by the rain. When figures are formed, they grow, change, shorten, gradually (very slowly) disappear and reappear. They are an outcome of a specific erosive process that lasts for centuries. There are two rare natural phenomena at the same spot: 202 earthen figures of different shape and dimension, from 2 m to 15 m in height, and from 0.5 m to 3 m in width, with stone caps on the top. The gullies also have strange names: " Devil's Gully" and "Hell's Gully". Earthen figures or "towers" as the locals call them, are located in the watershed between two gullies, whose sources joined together create a unique erosive formation, tremendously demolished by the erosive processes. Why Devil's town has Devil's water In the south of Serbia, lies a first-class natural landmark " Devil's Town" at an altitude of 660-700 m.
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