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.
Oceanic crust may be heavier and denser, but continental crust is thicker and older. The depth of continental crust varies more than oceanic crust and can be anywhere between six and 47 miles thick. The rocks that make up continental crust are less dense and heavy than basaltic ocean crust.