PlzeÅ (Czech pronunciation: [ËplÌ©.zÉÉ²]), also called Pilsen in English and German, is a city in western Bohemia in the Czech Republic. About 90 kilometres (56 miles) west of Prague, it is the fourth most populous city in the Czech Republic.
The Chromosphere. Click on image for larger version. The chromosphere is an irregular layer above the photosphere where the temperature rises from 6000&degC to about 20,000&degC. At these higher temperatures hydrogen emits light that gives off a reddish color (H-alpha emission).
The ozone layer, a fragile protective shield. The stratosphere is the portion of the atmosphere located at an altitude of in between 10 to 60 km. Within the stratosphere, the ozone layer is the portion that contains the highest proportion of ozone gas.