2. the water quality is "good" if the count of e coli is 0; otherwise, the water quality is still bad. calculate the proportion of wells with "good" water to wells whose water is not good. from this measure does it appear that the quality of water improved? explain and use the proportions that you calculated. (in g11 and h11 calculate the percent clean for before and after.)

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).