Ground cover is a term used to describe the layer of material that covers the ground. Mulch, MACADAM, SOD, GRASS, DEW, DIRT, tarp, and PAVEMENT are all types of ground cover. Mulch is a protective layer of organic material such as wood chips or bark that is spread over the soil to retain moisture and prevent weeds. MACADAM is a type of road construction that involves layers of crushed stone and gravel. SOD is a layer of GRASS and its roots that is grown on top of soil. GRASS is a type of plant with long narrow leaves that grows in clumps. DEW is a type of condensation that forms on surfaces when the temperature drops. DIRT is a type of soil that is made up of small pieces of rock and organic matter. Tarp is a waterproof sheet of plastic or canvas that is used to cover objects or areas. PAVEMENT is a hard surface made of concrete or asphalt that is used for roads and pathways.