Chp 10.2 Notes Groundwater Erosion & Deposition. Main Idea: Landforms caused by the chemical weathering of limestone are called karst topography . Two Requirements for Karst Topography!. ACIDIC WATER IS FORMED BY a CARBONATION PROCESS: Describe:
Main Idea:Landforms caused by the chemical weathering of limestone are called karst topography.
ACIDIC WATER IS FORMED
BY a CARBONATION PROCESS:
Water drips down through soil and reacts with carbon dioxide. This creates carbonic acid, a relatively weak acid.
Limestone (Rock) +
Carbonic acid dissolves limestone slowly, over a long period of time.
An area of limestone that has been chiseled away and is exposed at earth surface
A hole that forms and “swallows” a stream as underground limestone is dissolved
Rainfall in the soil absorbs carbon dioxide &reacts with decaying vegetation, creating acidic water. Acidic water moves through spaces underground, SLOWLY dissolving limestone, creating cavities. Cavities gradually get enlarged & carry even more acidic water. Sinkholes formed when the land surface above finally collapses by gravity & then sinks into the cavities.
Describe:Hollow, elongated forms of various
minerals deposited from solution by slowly dripping water. They hang from a cave ceiling.
Describe: Cones or massive mounds of calcite deposits that grow up from a cave floor due
to dripping water.
Describe: Known as “decorative cave formations”. Threads of deposited minerals that hang from a cave ceiling and sprout from a cave floor as a result of dripping water.