Landslides can move extremely slowly, perhaps just a few centimetres in a year. This will cause telephone poles, trees, and fences to tilt and appear deformed. Sudden landslides, particularly those involving large amounts of water or mud, or where rocks are falling, can move up to 360 kilometres per hour. Landslides involve very heavy, fast-moving material; the enormous weight and power of these events can easily sweep structures from their foundations and carry them with the landslide to its final settling point.