Humic type of coal that is predominantly composed of mixed plant debris.
2
In order that the phosphoric acid may be the more fully liberated by the humic acid, &c., of the earth, a little silicious sand is mixed with the still molten slag after it has been poured off from the molten steel.
3
It contains considerable humic matter, discolouring rapidly in the air (when exposed it is characteristically a bright buff).
4
The stream bottoms of alluvium are modified by loess and humic deposits, and are of course very fertile; but hardly more so than the loess of the uplands.