The Gulf Stream circulates around the world, warming up different parts of the planet for different reasons. It's really important to our climate and without out we'd be uh..stuffed. :)
Water moves toward the poles and back.
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.
Many parts do freeze! However, it does require much lower temperatures to freeze ocean water than fresh water, mainly because the ocean is composed of salt water. Dissolving anything (including salt) in water lowers its freezing point and raises its boiling point.
Because there are thousands (for real) of things dissolved in it
Salinity can vary because of water temperature, rivers emptying into the ocean and mixing with ocean water, ice forming or melting, evaporation and precipitation. I think temperature is the biggest reason.
If you put an ice cube in a glass of water the water level will rise because the cube displaces the water. Now if you check the water level after the cube melts, it will be the same. So ocean levels will not change if floating chunks of ice melt. However, If the ice is on land and melts and the water runs into the ocean, that will increase the water level.
warmer, lighter equatorial. Cold sinking cold salty polar. Warm rising equatorial.
its mainly because of tetronic platlets fond under the earth and the wind. some may occur due to heating up in one part and cooling up in other part
the ocean because its the largest water source on earth
Current
This occurs because of gravity. Water runs from the highest places (mountains and plateaus, or where rainfall occurs) to the lowest point, into the ocean.
Deep ocean circulation(90% of ocean water) is caused by differences in temperature, salinity and suspended load. It is referred to as "Thermohaline"- meaning heat and salt- circulation.
Thermohaline circulation brings oxygen rich water to the deep ocean.
Deep water ocean current
Heat
Heat.
Not at all because when the water evaporates the salt remains unchanged
Thermohaline circulation is the process of cold water at the poles creeping along the ocean floor. It meets with north and south polar water creates a dawdling subsurface circulation.