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Examples are soluble salts as: sodium chloride and other chlorides, nitrates, sulfates, phosphates etc.
anything that contains either nitrates or phosphates. Manure, sewage, plant debris.
Phosphates are bad for rivers, lakes, and oceans.
nitrates
Fertilizers used in agriculture are partially drained in lakes an rivers.
No, rivers flow into oceans, and "source" implies "from." Sources of rivers are found in the mountains.
rain water and water used to irrigate crops can carry these nitrates to rivers and lakes
Phosphates are fertilizers. When excess amounts of phosphates enter bodies of water (rivers, lakes, etc.) there will be a tremendous growth of algae as a result of the fertilization. This algae will eventually form large masses of rotting vegetable matter which will deplete the oxygen in the water which kills all the fish. Then you have dead rotting fish along with the dead rotting vegetable matter, and the whole thing is very nasty.
Ice, rivers, lakes, and groundwater are all sources of freshwater
oceans
No, they do not. Their sources are in the west.
rivers