A CLOD is a small lump of soil or clay. It is usually composed of a combination of sand, silt, and clay particles. Clods are often found in agricultural fields, where they can be broken down into smaller pieces by plowing or tilling. Clods can also form naturally in areas with high levels of moisture, such as near rivers or lakes. Clods are an important part of the soil structure, providing aeration and drainage for plants.