| A | B |
|---|
| model | a representation of an object or process |
| boundary | the limit or border of an area or region |
| structure | something built by people, like a building |
| map | a drawing of an area, usually as though you were looking down on it |
| cartographer | a person who makes maps |
| grid | a network of vertical and horizontal lines that form squares |
| flash flood | a rapid rise or fall of water with little or no advance warning |
| symbol | a color, shape, or texture used to represent something else on a map |
| key | an explanation of symbols used on a map |
| erosion | the gradual wearing away of earth materials by water, wind, or ice |
| landform | a shape or feature of the earth's surface |
| flood | a heavy flow of water, which is greater than the normal flow |
| canyon | a V-shaped valley eroded by a river or stream |
| delta | a fan-shaped deposit of earth materials at a muth of a stream |
| plateau | a large, nearly level that has been lifted above the surrounding area |
| velocity | the speed that the water is traveling |
| meander | a curve or loop in a channel |
