With Best Regards: Closing Your Letter. June 17, 2014 by. When writing professional or informal emails and letters, it is often considered proper etiquette to complete your correspondence with an appropriate closing signature.
What two conditions are needed for clouds to form? Air must be cooled to its dew point and particles must be present in the air When are clouds formed by ice crystals instead of drops of liquid water?
Cirrus clouds have actually been spotted as well! In addition to forming on Earth, cirrus clouds can form on planets like Mars, Saturn, Jupiter, Neptune and Uranus! Although a cirrus clouds appears to be very flat and wispy, the thickness of a cirrus cloud is actually about 1.5 km! How do cirrus clouds form? Cirrus clouds are formed at very high altitude. When air masses reach these heights, the temperature drops drastically. These cold temperatures cause the moisture in the air masses to condense and actually freeze into ice crystals. This occurs above 8000m. Masses of ice crystals are visible to the human eye as a cirrus cloud.