Gases in the Atmosphere Crossword Puzzle

QUESTIONS LIST: air : this is a mixture of gases in the atmosphere, nitrogen : gas needed to make protein and makes up 78% of the air, evaporation : when water turns into water vapor, condensation : when water cools and forms clouds, gas : state of matter which moves about freely, argon : makes up 0.93% of the air, precipitation : when water falls to the earth as rain, collection : when water is collected in rivers, oceans and lakes, carbon dioxide : gas needed for photosynthesis and makes up 0.04% of the air, oxygen : gas needed for breathing and makes up 21% of the air, water cycle : process that recycles the water in the atmosphere over and over again.