On the first day of school, a class of th-grade students are given tour identical cubes of hard clay. The cubes are placed in four different conditions until the last day of school. At that time, the students make the following Observations
Sample 1 classroom cabinet - no noticeable changes
Sample 2 near a window lighter in color
Sample 3: freezer small cracks near comers
Sample 4: bottle of water - small amount of algae on top Which sample shows evidence of physical weathering?
Samolot
Samole
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Samples
Sample 4