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a)
| A | B |
| A rainbow is | wind blowing from behind a travelling aircraft. |
| Drift is | it is not windy. |
| Snowdrifts are | deviation by an aircraft from a set course due to winds |
| Tailwind is | violent or uneven movement of air. |
| Crosswind is | wind blowing from directly in front. |
| Headwind is | an arch containing the colours of the spectrum, formed in the sky, when the sun shines through rain or spray. |
| When it is calm | wind blowing across the direction in which aircraft are travelling |
| Turbulence is | deep banks of snow heaped up by the wind |
b)
| A | B |
| Fog is | thin mist. |
| Mist is | it is not completely dry, slightly wet. |
| Haze is | falling snow or hail mixed with rain. |
| Frost is | a cloud of minute drops of water vapour hanging just above the ground, less thick than fog but still difficult to see through. |
| When the runway is damp | a thick cloud of tiny drops of water close to or just above land or sea; thick mist. |
| When the runway is wet | it is covered with soft, usually dirty, melting snow. |
| Sleet is | it is covered, soaked or moistened with water. |
| When there is slush on the runway | weather condition in which temperature falls below freezing point. |
c)
| A | B |
| Snow is | a cloud formed of rounded masses heaped on a flat base. |
| Rain is | frozen water that falls to the ground from the sky in soft white flakes. |
| Sandstorm is | a cloud level. |
| Drizzle is | a storm in a desert in which sand is blown through the air by the wind. |
| Cirrus is | it is covered with cloud. |
| Cumulus is | a type of light wispy cloud, high in the sky. |
| When the sky is overcast, | condensed moisture of the atmosphere falling as separate drops. |
| Ceiling is | fine misty rain. |
d)
| A | B |
| Hail is | loud noise that follows a flash of lightning. |
| A hailstone is | frozen rain falling in a shower. |
| Tornado is | a funnel-shaped column of water between the sea and the clouds, formed when a whirlwind draws up a whirling mass of water. |
| Waterspout is | a storm with a violent wind, especially a West Indian cyclone. |
| Thunder is | a flash of brilliant light in the sky produced by natural electricity passing between clouds or from clouds to the ground, usually followed by thunder. |
| Lightning is | a small ball of hail. |
| Hurricane is | a violent tropical hurricane that occurs in the western Pacific. |
| Typhoon is | violent and destructive whirlwind. |
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