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                              Q:
                           
                           
                                                      | A) Limestone | B) Quartz | 
| C) Granite | D) All the above | 
                              Answer:   A) Limestone
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Karst is a type of landscape that is characterized by caverns, caves, sinkholes, and underground streams. These features were all caused by erosion of the underlying rock.
Limestone type of rock usually underlies a karst landscape.
 
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