the ozone layer absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations ofozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere and the inner core inner core is the Earth's innermost part and according to seismological studies, it has been believed to be primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 70% of the Moon's radius. It is composed of an iron–nickel alloy and some light elements.