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