Part C - Karst Topography Recall from the introduction that karst topography exists because some minerals dissolve when they come into contact with rainwater. Minerals that contain calcium carbonate are especially susceptible to dissolving. Sinkholes and springs are common karst landforms that have the following characteristics: • Sinkholes can develop slowly where rainwater infiltrates te dissolving soil and rock, slowly lowering the ground surface of an area. In these instances, sinkholes are shallow with gently sloping sides • Sinkholes can also form rapidly and catastrophically when the cave ceiling collapses, resulting in deep sinkholes with steep walls • Rainwater in karst landscapes flows on the surface differently than other types of terrain. Streams are fewer and less developed in karst areas because water readily infiltrates the ground • Limestone dissolution is often not spatially uniform. In some circumstances, nonuniform dissolution can lead to the formation of lower karsts, which are large structures of rock that have dissolved at a much lower rate than the surrounding rock that has eroded away Which of the following is true about karst landscapes? Select the two that apply. View Available Hints) Sinkholes form from the same process as cave formations the dissolution of minerals Consider two regions (Region A and Region B) with the same type of environment (eg, climate) except Region A has karst topography Region A must also have more streams. A karst landscape is expected in the southwestern United States where conditions are dry Karst topography erodes at different rates, meaning that tall karst towers might form. Sinkholes that form abruptly tend to be shallow and have gone, not stop walls