31. Liquid subsurface water would provide habitable conditions for exotic forms of life. 32. It is found in deep-terrestrial-subsurface sediments. 33. Since 1969, all US bromine has been produced from subsurface brine. 34. Other artefacts remain in surface and subsurface deposits across the entire site. 35. The Boomerangers maintained surface and subsurface surveillance in the Gulf of Tonkin. 36. Biologists say fish feed substantially more on subsurface bugs. 37. WELL LOGGING _ Devices to measure subsurface characteristics of oil and other wells. 38. Slight deviations are caused by inhomogeneities of subsurface structure. 39. A geotechnical investigation will include surface exploration and subsurface exploration of a site. 40. This is especially apparent when soil parent material is saline . subsurface drainage.