Places where rivers pour fresh water into the ocean have low salinty
Ocean water has a higher salinity than fresh water.
Ocean water is diluted by the rivers. Probably the best example of this is where the Amazon river meets the ocean. Approximately 160km away from the mouth of the river Amazon, the ocean water is still fresh enough to drink. It probably doesn't taste very nice though. IN ADDITION: Volume. The amount of fresh water that flows into the ocean can be measured in parts per million. It doesn't have the volume needed to change the salinity of the ocean as a whole. It would be equivalent to adding one drop of food coloring to a swimming pool and trying to notice the difference later. +++ Such dilution is local, but the ocean's salinity is by no means homogenous anyway. The water circulation is cyclic, with vapour from the sea being distilled water. Once it falls as rain or snow, it collects minerals from the rocks the rivers are eroding, helping maintain the sea's overall cocktail of dissolved salts. So the rivers have no real effect on the sea's saltiness overall, but if anything maintain it.
No, salinity is not uniform throughout the ocean. It can vary due to factors such as evaporation, precipitation, input of freshwater from rivers, and mixing of water masses. Salinity levels can be different in different regions and at different depths within the ocean.
The major source of oceanic salinity is the dissolution of ions from rocks on land that are carried into the ocean by rivers. This process adds various salts to seawater, contributing to its overall salinity. Additionally, hydrothermal vents on the ocean floor can also introduce elements and minerals that affect salinity.
The addition of rain and river water to the ocean does not decrease its overall salinity because rain and river water are fresh water sources with low salinity levels. While these sources do mix with the ocean water, the vast volume of the ocean dilutes the impact of the fresh water input, thus maintaining the ocean's overall salinity.
Yes, yes they do!!
Salinity is a measure of how salty water is. Ocean water is more salty in some places than in others. The answer is yes, places where rivers pour fresh water into the ocean have low salinity because fresh water is normally cold and in warm areas, ocean water evaporates quicker. When this happens, salt is left behind and the ocean water has a higher salinity.
rain, snow, and melting ice add fresh water to the ocean, lowering the salinity there. Salinity is also lower near the mouths of large rivers. These rivers empty great amounts of fresh water into the ocean.
The lowest areas of salinity in an ocean are near where fresh water rivers empty into them. This is because the influx of fresh water creates an area of lower salinity compared to the remainder of the ocean.
A river flowing into the sea is causing the decrease in salinity
Rivers and rain are the two that I can think of.
Salinity remains relatively constant over time because there is a balance between the influx of fresh water (from sources like rivers and precipitation) and the evaporation of water from the ocean. Any changes in salinity are usually localized and temporary, as the ocean has a large volume and slow mixing processes.
Ocean water has a higher salinity than fresh water.
Ocean water is diluted by the rivers. Probably the best example of this is where the Amazon river meets the ocean. Approximately 160km away from the mouth of the river Amazon, the ocean water is still fresh enough to drink. It probably doesn't taste very nice though. IN ADDITION: Volume. The amount of fresh water that flows into the ocean can be measured in parts per million. It doesn't have the volume needed to change the salinity of the ocean as a whole. It would be equivalent to adding one drop of food coloring to a swimming pool and trying to notice the difference later. +++ Such dilution is local, but the ocean's salinity is by no means homogenous anyway. The water circulation is cyclic, with vapour from the sea being distilled water. Once it falls as rain or snow, it collects minerals from the rocks the rivers are eroding, helping maintain the sea's overall cocktail of dissolved salts. So the rivers have no real effect on the sea's saltiness overall, but if anything maintain it.
Yes; rivers run into the ocean at places called Estuaries. What evaporates from the ocean, and is dropped as freshwater in raindrops.
No, salinity is not uniform throughout the ocean. It can vary due to factors such as evaporation, precipitation, input of freshwater from rivers, and mixing of water masses. Salinity levels can be different in different regions and at different depths within the ocean.
Ocean water has a higher salinity (salt content) than fresh water does.