| Term | Definition |
|---|
| Hills | Depicted by closed rings of contour lines that get successively smaller towards the top of the hill. |
| Valley | Streched out groove in the land usually formed by streams or rivers. Begins with high ground on 3 sides, and usually has level ground of a lower elevation at its bottom where the water course is found. Shaped in U/V shapes, V points upstream to higher ground. |
| Ridge | Sloping line of high ground. The contour lines forming a ridge tend to have a U or V shape with the closed end point away from the high ground. |
| Depression | A low point in the ground or a sink hole surrounded by higher ground on all sides. |
| Concave | This type of slope is depicted by contour lines that are close together towards the top of the terrain feature and are widely spaced towards the bottom of the slope. |
| Convex | This type of slope is depicted by contour lines that are widely spaced towards the top of the terrain feature, and are close together towards the bottom of the space. |
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