Choices:
A). exposure to cold;
B). the oak can fall;
C). mechanical weathering;
D). the looseness of soil;
E). In the winter;
F). Metling snow;
G). colder and wetter;
H). looseness of dirt or compost;
Q: Fact 1: Cycles of freezing and thawing water cause ice wedging. Fact 2: Ice wedging is the most important form of mechanical weathering. Given the two facts above, cycles of freezing and thawing water cause ?
A:
C).