11. Unlike runoff water and subsurface water penetration that comes from outside the house, condensation is an interior problem. 12. They would dig for subsurface water and other materials they could convert into fuel for the trip home. 13. Too much subsurface water can be counterproductive to agriculture by preventing root development, and inhibiting the growth of crops. 14. Some subsurface water associated with geothermal sources contain high concentrations of toxic elements such as boron, lead, and arsenic. 15. When natural water sources are unavailable, the Asiatic wild ass digs holes in dry riverbeds to access subsurface water . 16. _A snakelike tube that will drill thousands of feet into the Martian crust, seeking subsurface water and, perhaps, microbes. 17. It will also look for subsurface water , which may aid in understanding whether life could once have existed there. 18. The elapsed time since a subsurface water mass was last in contact with the atmosphere is the tracer-derived age. 19. The European Space Agency will loft its complementary Mars Express mission, also slated for June, to search for subsurface water . 20. In 2000, of nitrogen came from groundwater and subsurface water , came from row crops, and came from hay and pastures.
