Q. When the Sun is '4' to '16' degrees below the horizon in mesosphere layer of atmosphere is classified as

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Q. Layer of Earth's atmosphere which is used by International Space Station is known as

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Q. Height of thermosphere is

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Q. Top area of third layer of atmosphere 'mesosphere' is known as

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Q. The name of extremely effective fire extinguishing agent is

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Q. Chemical substance used in industry for cold cleaning, is known as

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Q. Layer of atmosphere in which the Ozone layer lies is

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Q. Montreal protocol to reduce the production of chlorofluorocarbons was assigned in

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Q. Number of atoms in ozone molecules are

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Q. Layer which saves the life from harmful effects of 'UV' radiations is known as

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Q. Chemical released by chlorofluorocarbons is

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Q. Methyl chloroform, carbon tetrachloride, hydro fluorocarbons and chlorofluorocarbons are mainly known as

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Q. When chlorofluorocarbons are released in atmosphere, the chlorine chemical destroys the

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Q. Color of ozone molecule is

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Q. Most serious group of chemicals emitted in British Columbia that causes depletion of ozone layer are

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Q. Height of ozone above the surface of Earth is

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Q. Name of the protocol signed to reduce the production of chlorofluorocarbons is

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Q. Annual ozone hole is located on continent

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Q. Chemical group 'Halons' are emitted in

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Q. Parachute was invented in

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