WEATHERING AND EROSION.  Groundwater dissolves rock  Groundwater is often mildly acidic  Contains weak carbonic acid  Forms when rainwater dissolves.

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Presentation transcript:

WEATHERING AND EROSION

 Groundwater dissolves rock  Groundwater is often mildly acidic  Contains weak carbonic acid  Forms when rainwater dissolves carbon dioxide from the air and from decaying plants  Carbonic acid reacts with calcite in limestone to form calcium bicarbonate, a soluble material

 Solution channels – network of dissolved channels through limestone  Caverns  Most caverns are created by acidic groundwater dissolving soluble rock at or just below the surface in the zone of saturation  Features found within caverns  They form in the vadose zone

 Caverns  Features found within caverns  Composed of dripstone (travertine)  Calcite deposited as dripping water evaporates  Collectively, they are called speleothems  Includes stalactites (hanging from the ceiling) and stalagmites (form on the floor of a cavern)

 Karst topography  Landscapes that to a large extent have been shaped by the dissolving power of groundwater  Some common features include  Irregular terrain  Sinkhole or sinks (formed by groundwater slowly dissolving the bedrock often accompanied by collapse)  Striking lack of surface drainage (streams)

 Hot springs  Water is 6-9 o C warmer than the mean annual air temperature of the locality  The water for most hot springs is heated by cooling of igneous rock  West – closeness to volcanic activity  East – deep circulation of water – geothermal gradient

 Geysers  Intermittent hot springs  Water erupts with great force  Occur where extensive underground chambers exist within hot igneous rock  Groundwater heats, expands, changes to steam, and erupts

 Geysers  Chemical sedimentary rock accumulates at the surface  Siliceous sinter (from dissolved silica)  Travertine (from dissolved calcium car- bonate)