Superficial deposits are basically the things that cover the ground on top of the rocks. They are like the toppings on a cake. Sometimes, there may be pebbles, stones, soil or sand that have covered the rocks, and these are all examples of superficial deposits.
Think of it like playing with sand on the beach. When you are on the beach, you see that sand covers the ground. That sand is a superficial deposit. Similarly, if you go to a place like a forest or a mountain, you may see that the ground is covered in grass or leaves, and that is also a superficial deposit.
These deposits can be natural, meaning they have been formed over time, such as rocks breaking down into smaller pieces, or they can be man-made, like buildings and roads.
The reason why these deposits are important is that they can tell us a lot about the history of the earth. Scientists use these deposits to study the soil, climate, and other environmental factors that existed in the past. By studying these superficial deposits, they can get a better understanding of how the earth has changed over time, and how it is likely to change in the future.