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Biology 98 Online
OpenStudy (iwik):

An image showing acid rain falling on rocks, a root wedging, erosion by wind, and a Human digging the ground. Which of these pictures shows physical weathering processes by which soil is formed? Picture 1 and Picture 3 Picture 2 and Picture 4 Picture 2 and Picture 3 Picture 3 and Picture 4

OpenStudy (iwik):

i think its either a or c

OpenStudy (smoore777):

You are right. Which of these are natural and common? (Acid rain isn't common :))

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