Rocks and Soil (Earth Science)
Key Vocabulary sand This is a material that come from rocks. There is a lot of sand on a beach. clay This is a sticky and soft material from the earth. topsoil This is the soil nearest the surface of the ground. Topsoil is loose and soft. humus This is a substance made from dead plants and animals. Humus is in soil. granite This is a very hard, dull (gray) colored rock. Countertop. ...