Biogeomorphology is when nature, like plants, animals and the things they do, affects the way land looks and gets shaped. So, just like how we can shape sand into castles, animals like beavers or even tiny creatures like worms can shape the land by digging tunnels or making mounds. Plants, on the other hand, can help stop soil erosion by holding the soil in place with their roots. All these things add up and can change how the land looks over time. We can study these changes to understand how nature impacts the shape of the Earth.