<a href="http://www.primarygames.com/holidays/earth_day/games.php">http://www.primarygames.com/holidays/earth_day/games.php</a>  (Earth day games)

<a href="http://www.primarygames.com/holidays/earth_day/earthday.php">http://www.primarygames.com/holidays/earth_day/earthday.php</a> (Earth day activities + games)

<a href="http://nature.disney.com/">http://nature.disney.com/</a> (All things nature via Disney)

<a href="http://kids.nationalgeographic.com/kids/">http://kids.nationalgeographic.com/kids/</a> (All things earthly via Nat Geo for kids)

ü  <a href="http://kids.discovery.com/tell-me/earth">http://kids.discovery.com/tell-me/earth</a> (Educational Earth games and videos)