[lemma=soil] [lemma=contain] [□=□] □
[lemma=soil] [lemma=contain] [lemma=□] □
Subsurface soils contained high levels of site-related contaminants , primarily PAHs and VOCs , at concentrations that would result in a substantial health hazard . Unprocessed lunar soil contains high percentages of iron , magnesium , and titanium . At the same time , Chet Francis of the Environmental Sciences Division is hot on the trail of a method for selectively removing uranium from soils containing high concentrations of silt or clay . Such soils contain high concentrations of exchangeable sodium in which finer soil particles are dispersed , water and air cannot penetrate , and highly alkaline conditions are created . Soils contain high concentrations of carbon dioxide which dissolves in the groundwater , creating a weak acid capable of dissolving many silicate minerals . The usual environment of Histoplasma capsulatum is soil containing high concentrations of bird or bat guano , while Coccidioides immitis is most common in the Lower Sonoran desert of Arizona and California .