1) What is air? a) A mix of gas, water and aeresols b) A mix of solids 2) What gases are in the air? a) Oxygen,nitrogen, carbon dioxide b) Helium, hydrogen 3) What are the aeresols? a) Dust , pollen and smoke b) Water and leaves 4) Is the pressure on the mountain LOW? a) Yes b) No 5) What is the respiration? a) You breathe IN Oxygen, you breathe OUT Carbon Dioxide b) You breathe IN Carbon dioxide and you breathe OUT Oxygen 6) What is humidity? a) The amount of gases in the air b) The amount of water in the air 7) What is the atmosphere? a) The amount of water on the earth b) The amount of air around the earth 8) Why is the atmosphere important ? a) It protects the earth and keeps the temperature right b) It protects the earth from aliens' attack 9) How many layers are in the atmosphere? a) 7 b) 5 10) Why is the ozone layer important? a) It protects us from the satellites b) It protects us from the UV sun rays 11) Where can you find the Greenhouse gases? a) In the atmosphere b) In the oceans 12) Why are greenhouse gases important? a) They warm the Earth b) They cool the Earth 13) What is the problem of the greenhouse effect? a) The temperature on Earth is getting hotter and hotter b) The temperatures on Earth are freezing 14) What causes the increasing of CO2? a) factories,cars,deforestation b) planting trees, cleaning water 15) What can you do to help the environment? a) Walk,ride to school, turn off the computer and TV b) Go by car and turn on the TV and computers

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