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.
Describe the contents of the three soil horizons found in most mature soils. The A horizon, or topsoil, contains a mixture of mineral matter and organic matter, as well as many insects, fungi, and microorganisms. The B horizon, or subsoil, contains fine clay particles washed out of the A horizon. The C horizon contains partially weathered parent material.