An experiment was designed to measure the effect of sulfur dioxide emissions from a power plant on the ph of rain falling downwind of the plant. in this experiment, the average ph of rainwater upwind from the plant would be considered the

control

Explanation:

According to my research on experimental design terminology, I can say that based on the information provided within the question this factor is known as the control factor. This is the factor within an experimental design that the researcher has complete control over during the experiment. Unlike variables that he/she does not control.

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answer; i believe the correct answer is (solid gold);

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).