| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1 | Human Activity | 431 | 
                                    
                                    35.9%
                                 | 
| 2 | Natural processes | 112 | 
                                    
                                    9.3%
                                 | 
| 3 | Both human activity and natural processes | 106 | 
                                    
                                    8.8%
                                 | 
| 4 | None of these | 0 | 
                                    
                                    0%
                                 | 
| 7 | Not applicable | 548 | 
                                    
                                    45.7%
                                 | 
| 8 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9 | Don’t know / Haven’t heard enough | 3 | 
                                    
                                    0.3%
                                 |