The term 'Brown Hues' can refer to two different crossword solutions: 'Earths' and 'Ochres'. Earths are a type of soil that is composed of clay, silt, sand, and other minerals. It is usually brown in color due to the presence of iron oxide. Ochres are a family of earth pigments that range from yellow to red to brown in color. They are composed of clay and other minerals, and are often used in paints and dyes.