GEOLOGY

Detailed explanation-1: -An estuary is an area where a freshwater river or stream meets the ocean. In estuaries, the salty ocean mixes with a freshwater river, resulting in brackish water. Brackish water is somewhat salty, but not as salty as the ocean. An estuary may also be called a bay, lagoon, sound, or slough.

Detailed explanation-2: -Estuaries: Where the River Meets the Sea. Estuaries. Where freshwater rivers meet the salty open sea. There is a lot to love in an estuary.

Detailed explanation-3: -Brackish Water: Where Fresh Water Rivers Meet A Salt Water Sea. THE JOURNAL OF OUR OCEAN PLANET.

Detailed explanation-4: -Seawater has a more uniform composition than river water. It contains, by weight, about 3.5 percent dissolved salts, whereas river water has only 0.012 percent.

Detailed explanation-5: -High levels of sodium chloride make sea water salty. The salt build-up in oceans has been occurring through billions of years. That is why they have 300 times more dissolved salts than the fresh river water. In fact, one litre of sea water has 35 grams of dissolved salt.