A gully is like a big ditch in the ground, but it's not just any old ditch. It is a very special type of ditch that happens when rain or water flows down a slope or hill and forms a channel in the ground. Sometimes, these channels get bigger and deeper over time, and eventually become a gully.
Imagine you are playing with sand on the beach, and you build a little sandcastle. Now imagine that some waves come in and wash away some of the sand from your castle, leaving a small line of water in the sand. That little line of water would be like the start of a gully.
The main thing to know about gullies is that they can be really bad for the environment. When the big rain comes, the water will rush down the gully, eroding the soil, and washing away all the plants, trees, and animals in its path. This can cause soil erosion, landslides or mudslides, and pollution in rivers, lakes, and oceans.
So, to keep our environment safe and healthy, we need to be careful and prevent gullies from forming. That means planting trees, building terraces, and using good farming practices that keep the soil healthy and strong. If we take care of the land, we can prevent gullies and protect the environment.