The most important thing to learn about the OSI model is what it really represents. Pretend you're an operating system on a network. Your network card, operating at layers 1 and 2, will notify you when there's data available. The driver handles the shedding of the layer 2 frame, which reveals a bright, shiny layer 3 packet inside (hopefully).
Used with permission. Agate is a variety of chalcedony, a cryptocrystalline form of quartz. Translucency, patterns of color, or moss-like inclusions may distinguish this stone from other forms of chalcedony. Agates can show a wide variety of vivid, multiple colors.
Agate /ËaeÉ¡Ét/ ËÃ¦É¡Ét is a cryptocrystalline variety of, silica chiefly, chalcedony characterised by its fineness of grain and brightness of. colorhe first deposit on the wall of a cavity, forming the skin of the agate, is generally a dark greenish mineral substance, like celadonite, delessite or  green earth , which are rich in iron probably derived from the decomposition of the augite in the enclosing volcanic rock.