Positions W and X have different surfaces. W has sharp edges, while X has smooth edges. Which experiment will show how limestone can gain different surfaces? A Cover one piece of limestone with soil, and expose another piece to wind and chemicals.
B Use chemical agents on one piece of limestone, and use physical agents on another piece.
C Compress one piece of limestone, and stretch another piece.
D Melt and cool one piece of limestone, and break up and cement another piece.