Relier Pairs ScienceVersion en ligne Science par Margine Cascayan 1 Higher layer in the atmosphere 2 Reflects radio waves 3 Lowest layer in the atmosphere 4 Layer where jets fly 5 Prevent ultraviolet rays from reaching the atmosphere Ionosphere Exosphere Stratosphere Ozone layer Troposphere 1 Layer where jets fly 2 Prevent ultraviolet rays from reaching the atmosphere 3 Reflects radio waves 4 Lowest layer in the atmosphere 5 Higher layer in the atmosphere Troposphere Ozone layer Ionosphere Stratosphere Exosphere