As the difference in concentration between two areas increase does diffusion increase or decrease?

Diffusion is the movement of particles down their concentration gradient, meaning they flow from places of high concentration to places of low concentration.

Diffusion can be defined as the movement of substance from a area of higher concentration to area of lower concentration until the concentration gets equal across space.The difference between the concentration of molecules of the substance between two areas is said to be concentration gradient.As the difference in concentration increases, concentration gradient gets more steep thereby allowing  more rapid diffusion to take place, which means diffusion increases.

your answer is going to be physical weathering