| A | B |
|---|
| watershed | an area of land whose topography forces runoff water in one specific location |
| topography | study of the shape, or contour of the land |
| tributary | a small stream that flows into a larger stream |
| divide | the highest area of elevation in a region |
| contour lines | lines on a topographic map marking areas of similar elevation |
| contour interval | the amount of elevation change there is between two contour lines |
| runoff | water that does not soak into the Earth, but rather flows across it's surface |
| point source pollution | pollution entering a waterway from a specific, identifiable, location |
| nonpoint source pollution | pollution entering a waterway from a non specifically and unidentifiable location |
| Ohio watershed | the watershed we live in |
| acid rain | form a pollution resulting from nonpoint sources such as smoke from automobiles and factories |
