| A | B |
|---|
| Sun | The self-luminous gaseous central star of the solar system. It produces heat and light. |
| Wind | A noticeable natural movement of air. |
| Thunder | The noise accompanying a flash of lightning. |
| Cloud | A visible mass of watery vapor floating at various heights in the upper air. |
| Smog | A low-lying perceptible layer of polluted air. |
| Thermometer | An instrument for measuring temperature. |
| Atmosphere | The gaseous envelope or air surrounding the earth. |
| Precipitation | The depositing of dew, rain, sleet, etc. |
| Hail | Frozen raindrops or ice falling as pellets in a shower from the atmosphere. |
| Humidity | The amount or degree of moisture in the air. |
| Rain | Water falling from the atmosphere in the form of drops. |
| Sleet | Snow that has been partially thawed by falling through an atmosphere of a little above freezing point. |
| Snow | Frozen particles of water vapor that fall to the earth in soft, light, white, crystalline flakes. |
| Evaporation | The conversion of a liquid or a solid into vapor. |
| Hurricane | A violent tropical windstorm or cyclone often accompanied by heavy rains. |
| Lightning | The visible discharge of electricity between groups of clouds or between clouds and the ground. |
| Fog | Thick mist or watery vapor suspended in the atmosphere at or near the earth's surface. |
| Barometer | An instrument for measuring the weight or pressure of the atmosphere. |
| Tornado | A violently whirling column of air in a slender funnel shape. |
| Condensation | The conversion of gas or vapor into a liquid. |
