A lake is an inland body of standing water of considerable size. Lake Superior, one of the Great Lakes, is the largest freshwater lake in the world.
That body of water is called an estuary. It is a partially enclosed coastal body of water where rivers or streams flow into and mix with seawater. This mixing of fresh and salt water creates a unique and productive ecosystem.
Fresh and salt water are very different for one key reason, fresh water doesn't contain salt and salt water obviously does. There are different flora and fauna in fresh and salt water for this reason.
Salt waters of the Atlantic
Fresh water (of the same temperature) has the lower density ('lighter').
just add salt to fresh water
a large inland body of fresh water or salt water.
A fresh water loch is a significant body of water, generally inland, which is fresh - as opposed to salt - water. A loch is the Scottish term for lake.
Brackish water is a mixture of fresh and salt water. Rivers coming from inland headed to the ocean are fresh, then as they get closer to the salt water influences, the waters are brackish and then salt as you get closer to the ocean.
A large inland body of water is called a lake.
Puget Sound
Utah
Puget Sound
Salt water is more dense than fresh water. A ship would float higher at sea, and lower on a fresh water inland lake.
All oceans are salt water as well as the various seas. Only lakes and streams are fresh water. Ground water is mostly fresh, but sometimes it is salt water. (Some interesting and peculiar things happen when an inland lake is isolated with no outlet to the ocean, but that is a special case.)
No.
That body of water is called an estuary. It is a partially enclosed coastal body of water where rivers or streams flow into and mix with seawater. This mixing of fresh and salt water creates a unique and productive ecosystem.
Like all oceans, the Atlantic Ocean is a body of salt water.