A layer of air which covers the earth.

A map showing large-scale weather patterns in an area at a given time.

Rain that is more acidic than normal because water vapour has condensed ion to particles of sulphate or nitrogen oxide.

The transfer of some property (e.g. temperature or moisture) by the horizontal movement of air or water, such as wind or ocean current.

Fog caused by the condensation of water vapour when warm, moist air crosses cold ground or sea.

A suspension of microscopic liquid and solid particles in the atmosphere for at least a few hours. Can be natural or anthropogenic (man-made).

A naturally occurring mixture of gases, chiefly nitrogen and oxygen with small amounts of argoin, carbon dioxide and water vapour- we sometimes call this our atmosphere

A large area of air which has similar temperature and humidity characteristics.

The weight of the atmosphere pressing down on the Earth’s surface as a result of gravity

The height of the something above sea level. It is usually measured in feet or metres. Sea level is an altitude of 0m.