SONG #1: Humus, sand, silt, clay, and rock ( tune: “London Bridge is Falling Down”) Humus, sand, silt, clay, and rock (3X) Humus, sand, silt, clay, and rock Help make up soil. Humus has thenutrients, (3X) Humus has the nutrients in the topsoil. Sand is made of worn down rock, (3X) Sand is made of worn down rock. Rocks help form soil. Silt is smaller than the sand,(3X) Silt is smaller than the sand and helps plants grow. Clay can hold thewater well, (3X) Clay can hold the water well and help build things. Humus, sand, silt, clay, and rock (3X) Humus, sand, silt, clay, and rock Help make up soil.