TED Talks
Ted: Ted Ed: What Is an Aurora?
Why do we see those stunning lights in the northern- and southernmost portions of the night sky? Michael Molina explains every step of the dazzling phenomenon of the Aurora Borealis and Aurora Australis. [4:10]
NASA
Nasa: Image Science Center: Ask the Space Scientist Earth
Site from NASA contains a collection of 91 questions pertaining to the Earth's atmosphere, magnetic field, ionosphere, rotation and origin of life.