| A | B |
|---|
| ionosphere | A region of the earth's atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. |
| hydrosphere | The waters of the earth's surface as distinguished from those of the lithosphere and the atmosphere. |
| radiation | The physical phenomenon of radiating energy in the form of waves or particles. |
| air pressure | The pressure exerted by the atmosphere. |
| barometer | An instrument for measuring atmospheric pressure. |
| ozone layer | A layer in the stratosphere that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun. |
| convection | Heat transfer in a gas of liquid by the circulation of currents from one region to another. |
| conduction | The transmission of heat. |
| land breeze | A breeze that blows from the land toward open water. |
| sea breeze | A breeze that blows from open water to land. |
| jet stream | A high-speed, meandering wind current. |
| hydrogen | A colorless, highly flammable gaseous element, the lightest of all gases. |
