Lake is a region filled with water (could be fresh or salt water) that surrounded by Land. (humans on average couldn't cross a lake without vehicle)
Ponds is actually simlar with lands but have considerably smaller size (could be crossed without vehicle_
Stream of pools is a stretch from river area that had noticeable water movement and above average depth.
Natural resources would be the answer
Answer and Explanation: The difference between point and nonpoint source pollution is that point source pollution has a single, identifiable source while nonpoint source pollution is a collection of pollutants from many different sources, not all of which are readily identifiable.