Divergence is the movement of air away from an area of high pressure. Convergence is the movement of air towards an area of low pressure.

The Coriolis force deflects moving air as a result of the rotation of the earth.

ITCZ stands for Inter-Tropical Convergence Zone. The ITCZ is the meeting place of the tropical easterly winds from each hemisphere.

The polar front is the boundary between the warm light westerly air mass and the cold dense polar easterly air mass.

The pressure gradient is the horizontal difference in atmospheric pressure.

Tertiary winds are local winds that blow over short distances and for short periods of time.

The thermal belt of an area is the zone of the hottest temperatures, which coincides with the overhead rays of the sun.

Vorticity is the circulation of air around a low pressure centre.

The doldrums is a zone of low pressure at the equator.

The angle of incidence is the angle at which the rays of the sun strike a slope.

A cyclone is a low-pressure cell. Cyclones are also called depressions.

The pressure is very low In the eye of a tropical cyclone. Air converges and moves upwards in the eye. The rising air rotates around the low pressure system in a clockwise direction in the southern hemisphere and in an anti-clockwise direction in the northern hemisphere.

In an anticyclone (high-pressure cell), air moves in an anti-clockwise direction.

Temperature inversion occurs when the temperature increases as the altitude increases. Temperature inversions are caused by cold air collecting at the bottom of a valley.

The thermal equator is the zone of greatest heat. It is north or south of the equator depending on the overhead position of the sun.

Ferrel's law states that winds are deflected to their left in the southern hemisphere and to their right in the northern hemisphere.