sentences:  Sediment cores have shown evidence of separate lake stages with water levels mostly higher than today; higher moisture levels owing to a displacement of the tropical circulation during the Lake Tauca stage have been invoked to explain higher lake levels in Lejía and other regional waterbodies.Glaciers developed in the region as well but did not reach the lake.Precipitation around the lake is about mostly during the summer months, considerably less than the annual evaporation rate.