In an exothermic process, the initial heat content of the substance compared to the final is 1. Always lower
2. Always higher
3. Always equal
4. Either higher or lowers

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.