1) Which layer is closest to the Earth's surface? a) Troposphere b) Stratosphere c) Mesosphere d) Exosphere 2) What is the layer above the troposphere? a) Troposphere b) Mesosphere c) Stratosphere d) Exosphere 3) Which layer contains the ozone layer? a) Mesosphere b) Exosphere c) Tropopause d) Stratosphere 4) What is the outermost layer of the Earth's atmosphere? a) Mesosphere b) Exosphere c) Troposphere d) Exobase 5) Which layer is where most weather occurs? a) Mesosphere b) Exosphere c) Troposphere d) Stratosphere 6) What is the thinnest layer of the atmosphere? a) Troposphere b) Exosphere c) Stratosphere d) Mesosphere 7) Which layer is where meteors burn up? a) Mesosphere b) Stratosphere c) Exobase d) Tropopause 8) Which layer protects us from harmful UV radiation? a) Exosphere b) Troposphere c) Mesosphere d) Stratosphere 9) Which layer has the coldest temperatures in the mesosphere? a) Exosphere b) Mesosphere c) Troposphere d) Stratosphere 10) Which layer is where most airplanes fly? a) Mesosphere b) Stratosphere c) Exobase d) Troposphere

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