In 2006, three ski patrol members were killed at Mammoth Mountain ski resort after falling into a snow depression surrounding a volcanic fumarole and filled with cool CO 2 gas. High concentrations of CO 2 gas in soils can also damage or destroy vegetation, as is visible in several areas on Mammoth Mountain.
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The control group. (a) A control group is a group of participants who are not exposed to the in-. dependent variable, but whose experience is similar to that of the experi-. mental group. (b) By comparing the two groups, researchers can better determine the effect. of the independent variable.