Karst terrain is created from the dissolution of soluble rocks, principally limestone. Karst areas are characterized by distinctive landforms (like sinkholes) that results in aquifers that are highly productive but extremely vulnerable to contamination. Karst develops as rain falls through the atmosphere if picks up carbon dioxide (CO2). When this rain reaches the ground and passes through the soil it picks up more CO2 and forms a weak solution of carbonic acid. As the acidified rain water trickles down through cracks in the limestone, it begins to dissolve the rock. Over time it progressively enlarges the cracks and openings in the ground an underground drainage system starts to develop.
In this lab, my students will use sugar cubes, modeling clay and test tubes to simulate karst topography being created by acidified rain water.
More than half of students from low‑income households
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