It is called an ocean current
Air movement is caused by uneven heating of Earth's surface
The primary effect of heating a gas is lowering the density of the gas, making it lighter. Uneven heating of gas creates local density gradients, which will drive bulk movement of the gas via natural convection to get rid of the local density gradients.
convection
uneven heating
axis
The uneven heating of the earth's tempature.
Wind
Wind
Wind is caused by the uneven heating of the atmosphere. When an area has warmer air than surrounding areas, the air rises which creates a region of low pressure. The areas around it have higher pressure, and therefore air moves from there to the low pressure area. The movement of this air is called wind.
Convection occurs in any liquid or gas that has variations in density due to uneven heating.
Weather is caused by the atmosphere responding to uneven heating of the Earth by the sun. The uneven heating results in temperature differences. These are what are known as cold fronts, warm fronts and other phenomena.
Poop poo