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