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____ are subsurface layers of porous rock, gravel, or sand that hold water and enable groundwater to flow
18. ____ are subsurface layers of porous rock, gravel, or sand that hold water and enable groundwater to flow.
- Aquifers
- Unsolidated rocks
- Aqueducts
- Reservoir
Answer: A) Aquifers
Explanation:
Aquifers are subsurface layers of porous rock, gravel, or sand that hold water and enable groundwater to flow.