Salt minerals are usually found in sea facies, limnetic deposits, and salty soil in arid climate zones. With increasing evaporation, for example,calcium carbonateminerals such as calcite and aragonite will be precipitated from the water first, followed bycalciumsulfate mineral gypsum and then halite, sodium sulfate, and potassium magnesium ...
Get PriceTherefore, to build a transportation channel in the north under thegroundbecame urgent, and the city’s decision to launch a subway project was sensational. Iusedto imagine that Xi’an might have its own subway one day when I was taking Beijing metro, so I was surprised as I learned a subway line was about to be constructed in the city ...
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