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.
The farther the plate gets from the ridge that created it, the colder and denser ('heavier') it gets. When two oceanic plates collide, the plate that is older, therefore colder and denser, is the one that will sink. The rest of the story is a lot like the continental vs. oceanic plate collision we described above.