Rius:
http://www.xtec.net/~ealonso/flash/catrios1.html
http://www.xtec.net/~ealonso/flash/catrios2.html
http://www.xtec.cat/aulanet/ud/socials/rius/riuscata/decideix.htm
http://clic.xtec.cat/db/act_es.jsp?id=1421
Relleu:
http://www.xtec.net/~ealonso/flash/catorog2c.html
http://www.xtec.net/~ealonso/flash/catorog1c.html
http://www.edu365.cat/primaria/muds/socials/catrelleu/index.htm