When would the dam become irrelevant?
A. When the rocks are strong
B. When the rocks are impermeable
C. When the rocks are porous
D. When the rocks are weathered to a certain extent
Answer:C
When would the dam become irrelevant?
A. When the rocks are strong B. When the rocks are impermeable C. When the rocks are porous D. When the rocks are weathered to a certain extent