PASS YOUR MOUSE OVER THE QUESTION MARKS (???) FOR THE ANSWER TO EACH QUESTION! ANSWER WINDOW WILL OPEN. JUST CLICK OK TO MAKE THE ANSWER GO AWAY AND GO ON TO THE NEXT QUESTION!

1. Enveloping the world is a thick blanket of gases called?

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2. Earth's atmosphere has ...... layers.

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3. Moon gets very hot and very cold as it has no?

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4. 78 percent of the atmosphere is?

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5. 21 percent of the atmosphere is?

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6. The atmospheric layer immediately around the earth is called?

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7. The second atmospheric layer is called?

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8. The third atmospheric layer is called?

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9. The fourth atmospheric layer is called?

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10.The fifth atmospheric layer is called?

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11. Human beings inhale ......... and give out ........?

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12.Plants inhale ........ and give out .........?

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13.Water vapour condenses in the air to form?

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14.Bubbles in soda water is due to presence of?

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15. Ozone is actually a form of?

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16.We are protected from ultraviolet radiation from the sun due to the presence of?

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17. The main culprit which is destroying the ozone layer is?

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18.Increase in the average temperature of the earth is often referred to as?

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19.The process of stopping the reflected heat from the sun to escape into space by certain gases of the atmosphere is called?

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20.The main green house gas is?

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