The swelling/shrinking tendency of some silicate clay minerals is due primarily to _____.
a. the high Mg2+ contents in the octahedral layers
b. the movement of water molecules in and out of the interlayers of the crystal
c. the presence of cations attracted by the negative charges on the internal surfaces
d. substitution of Si4+ in the tetrahedral layers
Ans: b. the movement of water molecules in and out of the interlayers of the crystal
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