Date post: | 22-Mar-2016 |
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http://www.escola-horitzo.com/pangea/recerca/C/hidrosfera.htm
http://www.edu365.cat/primaria/muds/natural/aigua/
http://www.edu365.cat/eso/muds/ciencies/aigua/imatges/aigua2.swf
http://www.edu365.cat/primaria/muds/socials/erosio/index.htm #