Rich soil mixture is a type of soil composed of a combination of sand, silt, and clay. It is also known as LOAM, which is a four-letter word that can be found in crosswords. Rich soil mixtures are highly fertile and provide excellent drainage, making them ideal for growing plants. They are also able to retain moisture, which helps to keep the soil from drying out. Rich soil mixtures are often used in gardening and farming, as they provide the perfect balance of nutrients for plants to thrive.