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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.

1. Aquifers
2. Unsolidated rocks
3. Aqueducts
4. Reservoir

Answer: A) Aquifers

Explanation:

Aquifers are subsurface layers of porous rock, gravel, or sand that hold water and enable groundwater to flow.