ACROSS 7. lowermost layer of the atmosphere 9. causes water to become water vapor

10. process through which water vapor becomes droplets

DOWN 1. measures amount of moisture in the air 2. layer of the atmosphere that shields us from harmful rays of the sun 3. process that can separate salt from seawater to produce freshwater 4. process through which moisture falls from the air as rain or snow 5. gas that makes up about 78% of the atmosphere 6. condensed water droplets in the air 8. gas that people and animals need to live

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