Let's learn Biology and Geology in English!
Thursday, 4 September 2014
THE SOLAR SYSTEM
http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/activity.html
http://www.bbc.co.uk/science/space/solarsystem/
http://solarsystem.nasa.gov/index.cfm
http://science.nationalgeographic.com/science/space/solar-system
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