Different between corrasion and attrition

Corrasion is the process of mechanical erosion of the earths surface. It happens when materials get moved across it by running water, glaciers, waves, or wind. Attrition is a military strategy. It happens when the enemy is being worn down by the other, usually the one with greater resources wins. I don't know how those relate to each other, but that's the difference between the both of them!

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where