chp 10.2 notes groundwater erosion & deposition
DESCRIPTION
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: - PowerPoint PPT PresentationTRANSCRIPT
MAIN IDEA: LANDFORMS CAUSED BY THE CHEMICAL
WEATHERING OF LIMESTONE ARE CALLED
KARST TOPOGRAPHY.
Chp 10.2 NotesGroundwater
Erosion & Deposition
Two Requirements for Karst Topography!
ACIDIC WATER IS FORMED BY a CARBONATION PROCESS:
Describe: Water drips down through soil and reacts with carbon dioxide. This creates carbonic acid, a relatively weak acid.
ACIDIC RAIN WATER
Limestone (Rock) +
When the two meet
Action:Carbonic acid dissolves limestone slowly, over a long period of time.
The Structures formed
LIMESTONE PAVEMENTDescribe:An area of limestone that has been chiseled away and is exposed at earth surface
Shallow hole
Describe:A hole that forms and “swallows” a stream as underground limestone is dissolved
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.
Caves/caverns
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.
Stalagmites
Describe: Cones or massive mounds of calcite deposits that grow up from a cave floor due
to dripping water.
Speleothems
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.