Beach nourishment involves replacing sand lost through erosion by adding fresh sand brought from another beach or dredged from the sea floor. ... The fresh sand that is eroded away may also suffocate corals in the area. ... When constructed offshore, the breakwaters create zones of calm water behind them and deposition in this zone of calm shallow water gradually builds beaches. ... They allow water to pass around them, meaning no powerful backwash is generated. ... Sulphur dioxide reacts with water to form sulphur-based particles in the atmosphere. ...

• Word Count: 3336
• Approx Pages: 13