The carbonic acid in the soil, and of the humus-acids which appear to [Please select]
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The upper few inches of soil is humus rich in organic matter; below this is clay. [Please select]
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The last is due to top soil containing a large amount of humus from decaying vegetation. [Please select]
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The soil is usually damp, with thick leaf litter and rich humus. [Please select]
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Quodque fuit campus, vallem decursus aquarum Fecit: et eluvie mons est deductus in æquor: Eque paludosa siccis humus aret arenis; Quæque sitim tulerant, stagnata paludibus hument. [Please select]
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They kept the water within the country, preventing all effects of droughts, stimulating the growth of vegetation which by its decay, throughout the centuries, was steadily adding vegetable mold or humus to the sandy soil. [Please select]
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