Rich topsoils are a type of soil that is composed of a mixture of clay, silt, and sand particles. They are known for their high fertility and are often referred to as loams, which is a five-letter word used in crosswords. Rich topsoils are important for agriculture, as they provide the necessary nutrients for plants to grow. They also help to retain moisture, making them ideal for growing crops. Rich topsoils are also beneficial for the environment, as they help to reduce erosion and improve water quality.