| A | B |
| Space time compression | to describe the reduction in the time it takes for somthing to reach another place. |
| Distance decay | decreased contact because of decay. |
| Relocation Diffusian | The spread of a idea through physical movement of people from on place to another. |
| Diffusion | the process by whicha characteristic spreads across space from one place to another over time. |
| Hearth | the place from which somthing originates. |
| Expantion Diffusion | The spread of a feature from one place to another in a snowballing effect. |
| Hierachial Diffusion | the spread of an idea from persons or nodes of authority or power to other persons or nodes or places. |
| Contagious Diffusion | The rapid widespread diffusion of a charcteristic throughout the population. |
| Stimulation | The spread of an under lying principle. |