Workup. 1  Saylam G, Tanrikulu S, Dursun E, Iriz A, Eryilmaz A. A mass at fat density in the parotid gland: dermoid cyst or lipoma. B-ENT. 2009. 2  Sandborn WD, Shafer AD. A branchial cleft cyst of fourth pouch origin. 3  Thompson LD, Herrera HB, Lau SK. A Clinicopathologic Series of 685 Thyroglossal Duct Remnant Cysts.
Ozone forms readily in the stratosphere as incoming ultraviolet radiation breaks molecular oxygen (two atoms) into atomic oxygen (a single atom). In that process, oxygen absorbs much of the ultraviolet radiation and prevents it from reaching the Earthâs surface where we live.
Ozone is formed naturally in Earth's upper atmosphere. When the oxygen gas (O2) in the atmosphere is exposed to ultraviolet light, the chemical bond between the two oxygen atoms is broken. The extra oxygen atom bonds with an existing O2 molecule in the atmosphere, forming ozone (O3). Ozone is also formed from car exhaust, which contains nitric oxide (2NO), an unstable nitrogen and oxygen molecule.