Q. Earth is encircled in a layer of air, known as

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Q. Without ozone layer all terrestrial animals will be

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Q. Freon 12 belongs to group known as

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Q. Exposure to ultraviolet rays can cause:

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Q. 'ozone' layer from high flying jet is much lower than

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Q. Which chemical was used for cleaming equipements?

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Q. What does a single chlorine free radical destroy ?

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Q. Land and water dwelling plants, may suffer from

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Q. What is involved in ozone depletion ?

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Q. Greatest decline, being observed over America and Argentina, ranges from 5% to

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Q. When ultraviolet radiations strike ozone, it causes them to

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Q. How much stratospheric ozone layer's concentration extending above earth ?

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Q. Troposphere contains 10% of atmospheric

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Q. Antarctic ozone hole was caused by

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Q. HCFCs can be broken down in lower atmosphere, before ascending into the

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Q. According to scientists, CFCs are supposed to last for more than 100 years, in the

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Q. What screens out 99% of harmful rays of sunlight?

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Q. When did United states ban CFCs usage in spray cans?

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Q. What does high flying crafts deplete ?

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Q. What does ozone depleting chemical, HGs, contributing to ?

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