geo 10 formação das rochas sedimentares (biogénicas)
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Rochas Sedimentares
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A turfa é um material de origem vegetal, parcialmente decomposto, encontrado em camadas, geralmente em regiões pantanosas e também sobre montanhas (turfa de altitude). É formada principalmente por Sphagnum (esfagno, grupo de musgos) e Hypnum, mas também de juncos, árvores, etc. Sob condições geológicas adequadas, transformam-se em carvão, através de emanações de metano vindo das profundezas e da preservação em ambiente anóxico.
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A incarbonização ocorre ao abrigo do ar, nela intervindo bactérias anaeróbias. Durante a incarbonização, devido a reacções de redução, formam-se e libertam-se dióxido de carbono, metano e água.
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http://www.black-tides.com/uk/oil/what-is-oil/origin-oil-animation.php
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Resumo
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