Which of the following factors was varied in Study 1?
A. Distance from power plant
B. Size of soil sample
C. Distance from cemetery
D. Common gas levels

Study 1
A key mineral component of limestone is feldspar, which is also abundant in ground soil. Feldspar, as it weathers and decays, breaks down into another mineral, kaolinite.
The weathering process is often expedited by moisture from rain and humidity. Researchers measured the levels of feldspar and kaolinite in the soil of the cemetery and other locations at specific distances from the cemetery before and after rain showers. The results are shown in Table 1.

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Table 1 Before rain Distance from Amount of feldspar in Amount of kaolinite cemetery (m) the soil (g/ft³) soil (g/ft³) 26.3 29.1 29.9 30.8 32.4 0 125 225 325 425 13.7 12.9 12.4 12.1 11.5 After rain Amount of feldspar in Amount of kaolinite in the soil (g/ft³) the soil (g/ft³) 25.2 28.5 29.6 30.7 32.3 14.6 13.7 12.6 12.2 11.6