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open space provides moderation of temp, inflitration of rainwater runoff and aesthetic value fertile soil that can support the growth of health plants grain size determines soil texture oxidization weathering that gives a rock and soil reddish color what makes up the largest percentage of an average soil minerals what fraction of the earth is land that is not capable of supporting crops or people 1/8 what fraction of the earth can we grow food on? 1/32 parent material the source from which soil forms