Weather is an all-encompassing term used to describe all of the many and varied phenomena that can occur in the atmosphere of a planet. The term is normally taken to mean the activity of these phenomena over short periods of time, usually no more than a few days in length. Average atmospheric conditions over significantly longer periods are known as climate. Usage of the two terms often overlaps and the concepts are obviously very closely related.

Basic mechanism

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Weather phenomena result from temperature differences around the globe, which arise mainly because areas closer to the tropics, around the equator, receive more energy from the Sun than more northern and southern regions, nearer to the Earth's poles.

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Change in the Weather, A - Twitter Search

"back and forth we sway like branches in a storm; change the weather still together when it ends"
applequack (Alicia Michelle) Thu, 26 Nov 2009 19:52:04 -0000
"back and forth we sway like branches in a storm; change the weather still together when it ends"
drop in the ocean a change in the weather ... (8) old song..but i love it <3 <3
HannahMulhernx (Hannah Mulhern) Thu, 26 Nov 2009 18:19:15 -0000
drop in the ocean a change in the weather ... (8) old song..but i love it <3 <3
Roll with the punches on your next road trip: An unexpected change in weather had us shivering in Amman, Jordan. A ... http://bit.ly/7hzDc0
canadacomTravel (canada.com Travel) Thu, 26 Nov 2009 11:17:21 -0000
Roll with the punches on your next road trip: An unexpected change in weather had us shivering in Amman, Jordan. A ... http://bit.ly/7hzDc0
I love the Japanese news... weather woman just said "take care not to get a cold with the sudden change in temp.. http://bit.ly/750xto
love_japanese (Love In Japanese) Thu, 26 Nov 2009 10:43:17 -0000
I love the Japanese news... weather woman just said "take care not to get a cold with the sudden change in temp.. http://bit.ly/750xto
I love the Japanese news... weather woman just said "take care not to get a cold with the sudden change in temperature" #nothowcoldswork
camcavers (Cam Cavers) Thu, 26 Nov 2009 10:29:16 -0000
I love the Japanese news... weather woman just said "take care not to get a cold with the sudden change in temperature" #nothowcoldswork
shifted back to the project room and it's cold. funny how the weather can change in a split seconds
hidhub (hidhub) Thu, 26 Nov 2009 09:32:38 -0000
shifted back to the project room and it's cold. funny how the weather can change in a split seconds

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