| [removed] | Factor 2 is a natural factor and Factor 1 is influenced only by human factors. |
| [removed] | Factor 1 is a natural factor and Factor 2 is influenced only by human factors. |
| [removed] | Factor 1 is a natural factor and Factor 2 may be influenced by both nature and human factors. |
| [removed] | Factor 1 is a human induced factor and Factor 2 may be influenced by both nature and human factors. |
