Yes. All rivers are fresh water, but those that have Estuaries are then changed from Fresh to Tidal where the Sea has influence, but this is only restricted to the part of the estuary that is tidal. In rivers that are affected by modern Industries, Fresh may not be the appearance of the water, due to Pollution, which I suspect the Question alludes to, but the water, if it isn't salty, is essentially described as 'Fresh'.
For the most part, yes. The closer to the ocean, the saltier it gets. Around the Delaware Memorial Bridge is where it becomes mostly fresh.
Hudson Bay is in fact both. Taking into account the inflow of salt water that flows in from the Arctic Ocean (Fax Basin) and fresh water from the rivers that pour into James Bay/ Hudson Bay the ratio of fresh water to salt water is 2:5. Taking into account the fresh water that comes from the thawing of the ice cover on James Bay/Hudson Bay the ratio is 4:5.
It is salt water, because it is a continuation of the ocean water.
yes and no because it is the only one that has both salt and fresh water
Hudson bay is salt water.
estuary
Cape Cod Bay in Massachusetts is a salt water bay that borders the Atlantic Ocean. On the east shore of this bay is the historic Plymouth Rock.
an estuarie
A bay is a body of water bordered on 3 sides by land, and by definition the "4th side" is the ocean. Whether it is saltwater or freshwater will depend on where the water is from. If the bay is of an ocean, it will be of saltwater. If it is of a freshwater lake or river, it will be of freshwater.
A sea is a large body of salt water, sometimes a part of an ocean, which may be partially or completely enclosed by land. A bay is an indentation of the shoreline of a larger body of salt or fresh water.
Brackish they live in brackish Brackish water is a mixture of salt a fresh water like for example the....... Chesapeake bay
in west Bengal haldia river mixed in bay of Bengal sea water
It becomes what is know as brackish. An example of brackish water is the Chesapeake Bay, fresh water enters at the top of the bay from the Susquehanna as well as about 100 other streams and rivers. The bay then opens into the Atlantic Ocean. The Chesapeake is tidal, but is also constantly being fed with fresh water.