Bottom ash is a byproduct generated from the combustion of coal in power plants. It is the heavier material that settles at the bottom of the furnace after the burning process. Bottom ash typically consists of various minerals and unburned carbon, and it can vary in size and composition depending on the type of coal used. This material is often recycled for various applications, such as in construction, where it can be used as a lightweight aggregate in concrete or as a base material for roads. Additionally, bottom ash can be utilized in land reclamation projects, helping to improve soil quality and stability.