The hardness of water is determined primarily by the amount of calcium and magnesium it contains. ... Instead of having higher levels of calcium and magnesium, soft water tends to have higher concentrations of sodium, or salt.
Answer:
I believe the answer is II and III
Explanation:
I'm not sure if III is right cause I cannot read the last word but I think it's OK.
Hope this helped :)
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25% of 20
%=100
25/100 x 20
1/4 x 20
The answer is equal to 5
The mineral that is found is Sedimentary Rocks
