Sources / Links
http://eo.ucar.edu/webweather/
http://www.theweatherchannelkids.com/
http://kids.discovery.com/tell-me/curiosity-corner/weather
https://www.khanacademy.org/science/biology/tree-of-life/v/human-prehistory-101-part-2--weathering-the-storm
http://www.space-awareness.org/el/activities/6028/climate-zones/
http://www.space-awareness.org/el/activities/6029/the-thermal-layers-of-oceans/
http://www.space-awareness.org/el/activities/6027/the-climate-in-numbers-and-graphs/
http://www.space-awareness.org/el/activities/6025/global-warming-of-the-atmosphere/
http://www.space-awareness.org/el/activities/6022/water-is-a-heat-sink/
http://www.spacescoop.org/ ,
http://www.space-awareness.org/el/activities/6035/a-view-from-above/ ,
http://www.space-awareness.org/el/activities/6032/oceans-on-the-rise/
http://www.space-awareness.org/el/activities/6031/ocean-acidification/
http://www.space-awareness.org/el/activities/6030/transforming-water-into-acid-and-back/
Videos with students reciting poems or singing songs related to weather, like these:
http://www.youtube.com/watch?v=pVcL_LXhnNc
http://www.youtube.com/watch?v=7GLzE61qhgs
http://www.youtube.com/watch?v=_ZXdJ46IX0I
Paintings and/or photos revealing season changes in the same spot like this:
http://cristinan.artsteps.com/exhibitions/1815/Caracal_in_all_seasons
Maths problems related to weather exchanged between partner students and solved.
http://www.makinglearningfun.com/themepages/WeatherMathIdeas.htm
A brochure with the weather changes during the project and correspondent students’ feelings.
http://www.theforumsite.com/forum/topic/How-do-you-feel-when-it-rains-/390178
Quizzes, games, puzzles, related to the weather theme.
http://kids.discovery.com/quizzes/mythbusters/mythbusters-weather
http://www.sheppardsoftware.com/
They could also create their own games for their twins:
http://www.purposegames.com/
http://www.discoveryeducation.com/free-puzzlemaker/?CFID=70345751&CFTOKEN=35475651
http://www.jigsawplanet.com
http://www.teach-ict.com/quizhome.htm