caused by the chemical weathering of limestone are called karst topography Chp 102 Notes Groundwater Erosion amp Deposition Two Requirements for Karst Topography ACIDIC WATER IS FORMED ID: 1026574
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1. Main Idea: Landforms caused by the chemical weathering of limestone are called karst topography.Chp 10.2 NotesGroundwater Erosion & Deposition
2. Two Requirements for Karst Topography!ACIDIC WATER IS FORMEDBY a CARBONATION PROCESS:Describe: Water drips down through soil and reacts with carbon dioxide. This creates carbonic acid, a relatively weak acid. ACIDIC RAIN WATERLimestone (Rock) +
3. When the two meetAction:Carbonic acid dissolves limestone slowly, over a long period of time.
4. The Structures formedLIMESTONE PAVEMENTDescribe:An area of limestone that has been chiseled away and is exposed at earth surface
5. Shallow holeDescribe:A hole that forms and “swallows” a stream as underground limestone is dissolved
6. Sinkhole (hint: Avoid Limestone regions!!)Describe: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.
7. Caves/caverns
8. Stalactites (“don’t fall, hang on tite!”)Describe: Hollow, elongated forms of various minerals deposited from solution by slowly dripping water. They hang from a cave ceiling.
9. StalagmitesDescribe: Cones or massive mounds of calcite deposits that grow up from a cave floor dueto dripping water.
10. SpeleothemsDescribe: 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.