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ELL Earth Sci 24.2
Clouds and Fog
| Term | Definition |
|---|---|
| cloud | a large mass of atmospheric water droplets formed by condensation |
| condensation nuclei | small particles of ice, salt, dust and other solid matter on which water droplets can collect |
| condensation level | altitude in the atmosphere at which the temperature is cool enough for water droplets to form |
| stratus clouds | "sheetlike" or "layered" clouds found in the lower altitudes of the atmosphere |
| cumulus clouds | "piled" or "cotton-like" clouds found in the middle altitudes of the atmosphere |
| cirrus clouds | "curly" or "feathery" clouds found in the upper altitudes of the atmosphere |
| nimbus | clouds containing rain or snow |
| fog | a mass of atmospheric water droplets found very near the Earth's surface |
| radiation fog | fog formed by direct contact with ground that has a temperature below its dew point (also called ground fog) |
| advection fog | fog formed when warm air moves across a surface having a temperature below its dew point |
| upslope fog | fog forms when air cools as it moves up along land slopes |
| steam fog | thin layer of fog forming when cool air moves over warm inland rivers and lakes |