1. Freshwater ecosystems Extremely low salt count Different reservoirs for freshwater Colder water holds more oxygen Can be a nursery for marine organisms

2. Watershed & Wetlands Watershed- Region of land that drains into a river, river system or another body of water Wetland  marsh, swamps, bogs, – Filter and degrade pollutants. – Reduce flooding and erosion by absorbing slowly releasing overflows. – Help replenish stream flows during dry periods.

3. Rivers and Streams Moving body of water Typically from a lake/pond to the ocean Speed is faster the narrower the river/stream, slower if it is wider Humans can affect the height by dams or draining it for irrigation or drinking water

4. Ponds and Lakes Littoral zone  between high and low water marks along the shoreline – well lit, warm, shallow Limnetic zone (pelagic zone)  open water located further out from shore Benthic zone  lake or pond bottom, less sunlight, mostly bacteria (decomposers) live here