Underground water

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Across
  1. 2. A shaft sunk into the ground to obtain water,oil or gas?
  2. 6. The percentage of the total volume of a rock or sediment that consists of open spaces?
  3. 7. table The upper surface of underground water; the upper boundary of the zone of saturation?
  4. 8. A rock layer that stores groundwater and allows the flow of groundwater?
  5. 9. A cavity in the ground,especially in limestone bedrock,caused by water erosion and providing a route for surface water to disappear underground?
Down
  1. 1. The ability of a rock or sediment to let fluids pass through its open spaces,or pores?
  2. 3. Zone An area in which water travels downward to become part of an aquifer?
  3. 4. A spring is natural outflow of water from an underground supply to the ground surface?
  4. 5. Spring a spring whose water flows from a crack in the cap rock over the aquifer?