Changes

==Cloud formation==

==Cloud formation==

*Compared to cool air, warm air is less dense and is capable of holding more moisture in the form of water vapor. As a result of its low density, warm air low in the atmosphere tends to rise, expand, and cool. Every 1000 feet, it cools 5.5 Fahrenheit (10°C every 1000 m). Since this cooled air is no longer able to hold as much moisture, its moisture begins to condense into water droplets and form clouds. The opposite effect occurs in the atmosphere when air descends--it warms and dries. [http://www.cotf.edu/ete/modules/elnino/cratmosphere.html]

*Compared to cool air, warm air is less dense and is capable of holding more moisture in the form of water vapor. As a result of its low density, warm air low in the atmosphere tends to rise, expand, and cool. Every 1000 feet, it cools 5.5 Fahrenheit (10°C every 1000 m). Since this cooled air is no longer able to hold as much moisture, its moisture begins to condense into water droplets and form clouds. The opposite effect occurs in the atmosphere when air descends--it warms and dries. <ref>http://www.cotf.edu/ete/modules/elnino/cratmosphere.html</ref>

==Clouds and aerosols==

==Clouds and aerosols==

"Cosmic rays are charged particles that bombard the Earth's atmosphere from outer space. Studies suggest that [[cosmic rays]] may influence the amount of cloud cover through the formation of new [[aerosol]]s (tiny particles suspended in the air that seed cloud droplets)." [http://www.pparc.ac.uk/Nw/cloud.asp]

"Cosmic rays are charged particles that bombard the Earth's atmosphere from outer space. Studies suggest that [[cosmic rays]] may influence the amount of cloud cover through the formation of new [[aerosol]]s (tiny particles suspended in the air that seed cloud droplets)." <ref>http://www.pparc.ac.uk/Nw/cloud.asp</ref>

==Notes==

==Notes==