Springs form where a - there is no water table b - flooding makes streams overflow their banks c - groundwater sinks into the soil d - the water table intersects the ground surface 2 - groundwater contaminated by sewage from a ruptured septic tank can sometimes be naturally purified by flowing for a relatively short distance through a a - sandstone aquifer b - fractured limestone aquifer c - cavernous limestone aquifer d - spring where the water table intersects the ground surface 3 - a cavern is an underground chamber formed by a - erosion b - deposition c - evaporation d - runoff