Hydrogeology
5 questions tagged Hydrogeology — spanning every one of the seven Ws.
Why do natural springs sometimes turn deposits orange or red?
Spring deposits often turn orange or red because iron in the water oxidizes when exposed to air. The resulting iron oxides stain the sediments and rocks.
How do hot springs get their heat?
Groundwater circulates underground, sinks deep enough to meet hot rock, and rises back to the surface. In volcanic regions this heating can happen quickly; elsewhere it may be warmed by normal geothermal heat.
Why do geysers erupt in bursts instead of flowing continuously?
Geysers erupt in bursts because underground water is trapped, heated above boiling, and then suddenly released as pressure drops. The rapid expansion of steam forces water up through the vent.
How do geysers erupt on a regular schedule?
Underground water is heated by magma, pressure builds in narrow passages, and steam forces water upward in bursts.
How do hot springs become geysers?
Superheated water trapped underground builds pressure until it is explosively released through a narrow opening. The cycle of filling, heating, and pressure release produces periodic eruptions.