Fact 1: Damming a river can cause a lake to form.

Fact 2: Water ponding in a depression forms a lake.

Given the two facts above, answer the question "Damming a river can cause what in a depression?" with the following options: 
- storing water
 - less water
 - toxic water
 - silt
 - water ponding
 - dry stones
 - body water
 - drying out


 

     water ponding    