The statement "You are likely to find a river in a canyon" is true because A canyon is a contigous area of the earth, the elavation of which is much lower than the elevation of the surrounding area.  The movement of water can erode the earth resulting in a lower elevation.  Thus the movement of water in an area of low elevation results in an even lower elevation for this area. A canyon is a terrain feature formed by the action of moving water. Moving water is called a river.