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The voltage at a receptor site has just changed from -70 millivolts to -75 millivolts.What caused the change
Rock Powder
Finely ground rock that can be used as a soil amendment to provide minerals and nutrients for plant growth.
Sand
A grain or rock fragment smaller than 2 mm and larger than 1/16 mm.
Rounded Stones
Stones with smooth edges and surfaces typically resulting from extended water or wind erosion and abrasion.
Broken Shells
Shell fragments resulting from mechanical damage or natural wear and tear.
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