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http://www.universetoday.com/58177/earth-formation/
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https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=TDJCG7UUIcCb_M%253A%3Bu7T82cQfS6TJ1M%3Bhttp%253A%252F%252Fwww.sciencebuddies.org%252FFiles%252F3792%252F5%252FAstro_img104.jpg%3Bhttp%253A%252F%252Fwww.sciencebuddies.org%252Fscience-fair-projects%252Fproject_ideas%252FAstro_p033.shtml%3B500%3B471
https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=FtWjEsO5nHvrBM%253A%3B2NUr6JsaC1lifM%3Bhttp%253A%252F%252Feducation.arm.gov%252Fimages%252Fcms%252Flessonsreason.gif%3Bhttp%253A%252F%252Feducation.arm.gov%252Fteacher-tools%252Flessons%252Freason%3B360%3B253
https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=zSrsnUpyQwApxM%253A%3BVA3okLH3f51z9M%3Bhttp%253A%252F%252Fwww.learner.org%252Fjnorth%252Fimages%252Fimageshtml%252Fearth-tilt.gif%3Bhttp%253A%252F%252Fwww.learner.org%252Fjnorth%252Ftm%252FReasonsBack.html%3B500%3B397
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http://www.universetoday.com/58177/earth-formation/
http://www.universetoday.com/58177/earth-formation/
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https://www.google.ca/search?q=the+spheres+of+the+earth&source=lnms&tbm=isch&sa=X&ei=td0xVMWXGMGSyASAloC4Dw&ved=0CAgQ_AUoAQ&biw=1280&bih=885#facrc=_&imgdii=_&imgrc=p0LAm5fde6iKrM%253A%3BWHq8aut9J-ApjM%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fcommons%252Fthumb%252Fc%252Fcd%252FAtmosphere-Biosphere-Hydrosphere-Lithosphere.png%252F500px-Atmosphere-Biosphere-Hydrosphere-Lithosphere.png%3Bhttp%253A%252F%252Fen.wikibooks.org%252Fwiki%252FHigh_School_Earth_Science%252FPlanet_Earth%3B500%3B380
http://chiarana.blogspot.ca/2013/10/la-terra-e-le-sue-sfere.html
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https://www.google.ca/search?biw=1280&bih=879&tbm=isch&sa=1&q=paleozoic+era&oq=paleozoic+era&gs_l=img.3..0l10.783689.789017.0.790251.9.9.0.0.0.0.344.1437.0j7j1j1.9.0....0...1c.1.54.img..5.4.703.ZLZ9CQsde4o#facrc=_&imgdii=_&imgrc=Kv-rw1r5EYDLRM%253A%3BG4iiOxkty_pqZM%3Bhttp%253A%252F%252Fwww.corzakinteractive.com%252Fearth-life-history%252Fassets%252Fscenes%252F412a_ordovician.jpg%3Bhttp%253A%252F%252Fwww.corzakinteractive.com%252Fearth-life-history%252F412_ordovician.htm%3B320%3B230
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https://www.google.ca/search?biw=1280&bih=879&tbm=isch&sa=1&q=neolithic+revolution&oq=neolithic+revolution&gs_l=img.3..0l10.12438.24484.0.24969.20.18.0.1.1.0.266.266.2-1.1.0....0...1c.1.54.img..18.2.266.LExrQh0L80A#facrc=_&imgdii=_&imgrc=sYpk3dffonWh_M%253A%3B9vuKxjr9mwvcyM%3Bhttp%253A%252F%252Fhistory-world.org%252Fagriculture.jpg%3Bhttp%253A%252F%252Fhistory-world.org%252Fagriculture.htm%3B277%3B290
https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=TDJCG7UUIcCb_M%253A%3Bu7T82cQfS6TJ1M%3Bhttp%253A%252F%252Fwww.sciencebuddies.org%252FFiles%252F3792%252F5%252FAstro_img104.jpg%3Bhttp%253A%252F%252Fwww.sciencebuddies.org%252Fscience-fair-projects%252Fproject_ideas%252FAstro_p033.shtml%3B500%3B471
https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=FtWjEsO5nHvrBM%253A%3B2NUr6JsaC1lifM%3Bhttp%253A%252F%252Feducation.arm.gov%252Fimages%252Fcms%252Flessonsreason.gif%3Bhttp%253A%252F%252Feducation.arm.gov%252Fteacher-tools%252Flessons%252Freason%3B360%3B253
https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=zSrsnUpyQwApxM%253A%3BVA3okLH3f51z9M%3Bhttp%253A%252F%252Fwww.learner.org%252Fjnorth%252Fimages%252Fimageshtml%252Fearth-tilt.gif%3Bhttp%253A%252F%252Fwww.learner.org%252Fjnorth%252Ftm%252FReasonsBack.html%3B500%3B397
https://www.google.ca/search?q=reasons+for+the+seasons&biw=1280&bih=842&source=lnms&tbm=isch&sa=X&ei=l_ExVM2NKJCQyATkkIEY&ved=0CAgQ_AUoAQ#facrc=_&imgdii=_&imgrc=PWp4hfrQwj18AM%253A%3BIWGg33MbUpahMM%3Bhttp%253A%252F%252Fseasons.pppst.com%252Fbanner_reasons_seasons.gif%3Bhttp%253A%252F%252Fseasons.pppst.com%252Freasons.html%3B709%3B205
https://www.google.ca/search?biw=1280&bih=879&tbm=isch&sa=1&q=timeline+of+earth&oq=timeline+of+ea&gs_l=img.3.0.0l10.10844.14344.0.15125.14.11.0.3.3.0.140.1189.0j10.10.0....0...1c.1.54.img..1.13.1219.ZPyWqa-nxFU#facrc=_&imgdii=_&imgrc=GrLTj7SDDhRyqM%253A%3BxWYHvLpvYJsZLM%3Bhttp%253A%252F%252F3.bp.blogspot.com%252F-BCeYuZ40wI8%252FT8TlicIaelI%252FAAAAAAAAAA8%252FGcesf1lbo7k%252Fs640%252FX11385932-0.jpg%3Bhttp%253A%252F%252Fetlcnt.blogspot.com%252F%3B600%3B520