Fact 1: Cycles of freezing and thawing water cause ice wedging. Fact 2: Water is made up of H2O molecules. Given the two facts above, what freezes and thaws to cause ice wedging?
Select from the following.
[a]. h2o;
[b]. dams;
[c]. oxygen;
[d]. clouds;
[e]. carbon;
[f]. rain;
[g]. lake;
[h]. H20;
[a].