Bibliografia

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http://ciencias3c.cvg.com.pt/sistemaform.htm

http://www.eb1-aparecida-n2.rcts.pt/portefolio/images/sistema.jpg

http://www.guia.heu.nom.br/images/Sol.gif

http://scienceblogs.com/startswithabang/upload/2009/04/is_
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http://nautilus.fis.uc.pt/astro/img/ss/saturno/saturno_intro.jpg

http://clientes.netvisao.pt/luisgouv/mosaico_lua_web.jpg

http://www.malhatlantica.pt/cnaturais/images/plutao.jpg

http://heliades.no.sapo.pt/Correspondencia%20sistema%20solar/cometa%20west.gif

http://www.enciclopedia.com.pt/images/asteroide-01.jpg

http://2.bp.blogspot.com/_uVfXDDwMv28/SgEU4Rzx_
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http://www.brasilescola.com/upload/e/taiga.jpg

http://www.cm-montemornovo.pt/NATURA/fotos/FlorestaGaleria1.JPG

http://www.westpapuatrekking.com/images/cloud_forest[1].JPG

http://orbita.starmedia.com/dartagnan6/Imagens%20-%20Videoke/savana1.jpg

http://presentededeus.files.wordpress.com/2009/05/deserto.jpg

http://www.sogab.com.br/floresdias/celula.jpg

http://www.cepa.if.usp.br/energia/energia1999/Grupo4B/Eneralte/figuras/terra1.gif

http://sp1.imgs.sapo.pt/0009/06/80/c6/0680c696856bd66acc5f07a630239d11.jpg

http://luizalavenere.blog.uol.com.br/images/514306400a005ec0954ti6_2007.jpg

http://eternos.org/wp-content/uploads/2008/04/msh80_msh_eruption_05-18-80_krimmel_80s3-141_bwp.jpg

http://www.grupoescolar.com/a/b/A8FBA.jpg