Final answer:
The process of dispersion of an idea or an item from a center of origin to more distant points is called diffusion. There are two main types of diffusion: expansion diffusion and relocation diffusion.
Step-by-step explanation:
The process of dispersion of an idea or an item from a center of origin to more distant points with which it is directly or indirectly connected is called Diffusion. There are two main types of spatial diffusion: expansion diffusion and relocation diffusion. Expansion diffusion includes contagious diffusion and hierarchical diffusion. Relocation diffusion occurs when the idea or item is physically moved to a new location.