Final answer:
Characteristic karst formation landforms include sinkholes, underwater streams, and caves, which are formed by the dissolution of soluble rocks such as limestone due to acidic groundwater.
Step-by-step explanation:
The characteristic karst formation landforms include sinkholes, underwater streams, caves, and other features generated by the dissolution of soluble rocks such as limestone, gypsum, and dolomite. When acidic groundwater reacts with these rocks, it leads to the creation of underground voids and fissures, which may result in dramatic surface disturbances and formations such as sinkholes. Over time, this process can also create extensive cave systems, like the enormous chambers found in Mammoth Cave in Kentucky or Carlsbad Caverns in New Mexico.