Q: Fact 1: Damming a river can cause a lake to form. Fact 2: Water in the lakes is fresh, cool and transparent. Given the two facts above, what is the thing that is created by damming a river made of?

Pick your answer from: I. Sediment; II. Fresh water; III. loose soil; IV. swamp vegetation; V. mussels; VI. storing water; VII. body water; VIII. carbon dioxide;
The answer is:
II.