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vanessa Reliz
Nov 20, 2008, 11:12 AM
what causes the intensity and duration of solar radiation received at any place to vary throughout the year???

Eileen1218
Nov 20, 2008, 11:43 AM
The Sun ????:)

Capuchin
Nov 21, 2008, 02:04 AM
Read the following article:

Season - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Season)

There are many other mechanisms, but I think this is the one that you're getting at.