O desenvolvimento de camadas horizontais perceptíveis na superfície da crosta terrestre e que são constituídas por matérias orgânicas e minerais está condicionado ao desgaste ou alteração dos minerais. Este desgaste ou alteração é devido à decomposição biológica, aos agentes atmosféricos e a factores ambientais.
As características de cada solo dependem do tipo de rochas que se desagregaram, originando solos, e do ambiente no qual se desenvolveram. O solo hoje é estudado segundo a sua natureza física, as suas propriedades químicas e biológicas, e a sua produtividade.
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