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Hard water refers to the presence of dissolved ions, mainly of calcium Ca2+ and magnesium Mg2+ which are acquired through contact with rocks such as limestone and dolomite which contain calcium and ma ...
Hipervinculo Física
Soil and energy don't go together, right? One seems natural and a bit on the messy side while the other is a mysterious force that powers everything from our toasters to our cars. What two things coul ...
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