Industry, sector and description for Universal Display. Universal Display researches, develops, and sells organic light emitting diode (OLED) technologies and materials for the flat-panel display industry.
The first requirement for all master horizons other than O horizons is that they are composed mostly of mineral material. It is very important to be able to differentiate organic from mineral material. Dark color of the A horizon is due to the mixing of humus with mineral.
Question 10: This slice of soil was pulled from a wetland. The first 10 cm (4 inches; in the yellow box) is all decomposing organic matter. The dark gray layer underneath is mostly mineral with some organic matter mixed in. The horizon indicated in the yellow box is a(n) ____ horizon.