| A | B |
|---|
| The largest watershed in the US? | Mississippi |
| Local Downingtown watershed. | Brandywine |
| Regional Downingtown watershed. | Delaware |
| Four factors that affect where organisms live in the water. | Temperature, Sunlight, Oxygen, Nutrients |
| Organisms that float near the surface. | Plankton |
| Free swimming organisms (like fish). | Nekton |
| Bottom dwellers, often decomposers. | Benthos |
| The two zones that lakes and ponds can be divided into. | Littoral-near shore. Benthic-bottom. |
| Two freshwater wetland types. | Marsh-nonwoody shrubs. Swamp-SE US, woody shrubs. |
| Eutrophication | Increase in the nutrients in an aquatic ecosystem causing a large amount of plant growth. |
| Freshwater Wetlands | Areas covered by water at least part of the year. |
| Benefits of wetlands | Filtering water, flood control, habitat, recreation |
| An area in which fresh water from a river mixes with salt water from the ocean. | Estuary. |
| What percent of the water on the Earth's surface is fresh? | 3% |
| What percent of the Earth's freshwater is available for use? | Less than 1%. |
| Swamps along coastal areas of tropical zones. | Mangrove swamps. |
| Long, thin islands that protect the mainlands. | Barrier islands. |
| Limestone ridges built up by corals. | Coral reef. |
| Areas of rising cooler water in the ocean that are nutrient rich. | Upwellings. |
