longshore current
southern equatorial current
Yes, it is correct.
The mouth of a stream is where the stream flows out into a larger body of water.
Lake
tributary
tributary
tributary
tributary
No, the Gulf Stream actually warms the climate of the east coast of the US. It carries warm water from the Gulf of Mexico across the Atlantic Ocean, helping to moderate temperatures along the coastline.
The stream of water which flows like a river through the ocean is a current. The Gulf Stream is the most significant such current which flows from the tropics to the northern latitudes.
There is no single name for a single stream of water that flows into an ocean but headwaters would be a good one for a single stream of water into a lake
This is the water cycle.