Matching Pairs ScienceOnline version Science by Margine Cascayan 1 Lowest layer in the atmosphere 2 Layer where jets fly 3 Reflects radio waves 4 Prevent ultraviolet rays from reaching the atmosphere 5 Higher layer in the atmosphere Ionosphere Ozone layer Exosphere Troposphere Stratosphere 1 Lowest layer in the atmosphere 2 Higher layer in the atmosphere 3 Prevent ultraviolet rays from reaching the atmosphere 4 Layer where jets fly 5 Reflects radio waves Ozone layer Ionosphere Troposphere Stratosphere Exosphere