general knowledge 50

Test # 50

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1.
The Hydrochlorofluorocarbons (HCFCs) are the compounds which have the following molecules: 1. Hydrogen 2. Carbon 3. Chlorine 4. Fluorine Which among the above plays the most important role in Ozone depletion?

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Roger Bannister of Great Britain was the first man to run a mile in under four minutes. On May 6, 1954, he ran the mile in 3 minutes 59.4 seconds.      .. More >>

blanched:
adj.
1.ash-colored or anemic looking from illness or emotion
2.(especially of plants) developed without chlorophyll by being deprived of light      .. More >>

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