Air is a mixture of nitrogen, oxygen and smaller amounts of many other substances. If air is filtered and cooled to low temperatures it becomes a mixture of liquids. Nitrogen gas and liquid oxygen can be separated from this ‘liquid air’ by fractional distillation. The table shows the boiling points of nitrogen and oxygen. Use your knowledge and understanding of fractional distillation, and the information given, to explain how nitrogen and oxygen can be separated from air.

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.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

1 is the answer to this problem