Moss is a small flowerless green plant. It has no true roots. It absorbs water and minerals from the soil. It forms low green carpets on the surface of the ground in damp habitats such as rainforests and woodlands. It also grows on moist rocks. As the rocks dry, the moss also dries up, but does not die. It gets revived when the rocks moisten again. There are at least 12,000 types of moss found across the world. White moss is green clumps of pin-cushions on moist ground. Peat moss grows at the edges of swampy soil, lakes and pools. Mosses provide a great habitat and source of food for insects and other invertebrates. Humans have also utilized mosses. Traditionally, moss has been used for packing food and to insulate houses.