1) which of the following gases protects us from harmful Sun rays ? ? a) Carbon dioxide b) Nitrogen c) Ozone layer 2) the most important layer of the atmosphere is ? a) Troposphere  b) Thermeosphere c) Mesosphere 3) which of the following layers of the atmosphere is free from clouds ? a) Troposphere  b) Stratosphere c) Mesosphere 4) As we go up the layer of the atmosphere the pressure. a) Increases b) Decreases c) Remains the same 5) When precipitation comes down to the earth in the liquid form it is called ? a) Cloud b) Rain c) Snow

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