Earth (Prithvi) is the idea of solidity and stability. Apiece of wood, metal, plastic or a blade of grass is made up of the idea of solidity. Earth simply represents the solid form of matter and the principle that provides stability. In the body, earth represents our physical structure. In the mind, it represents mental stability.
Water (Apas) is the idea of flow and liquidity. Water represents the liquid form of matter .It has no inherent motion of its own but flows along the path of least resistance. Water represents not only H20 but all liquids, including metals and oils. In the body, water represents fluid; in the mind, it represents gentle, loving and compassionate emotions.