The Great Smog of 1952 was a severe air-pollution event which affected _______.
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Panthera Tigris is the scientific name of
In 2004, NASA launched the Messenger Spacecraft to study ___.
_____________ is the number of deaths in the population during a given period.
Fabric made from_________ does not get wrinkled easily.
An _______________ is a sudden shaking or trembling of the earth.
One of the best solutions to get rid of nonbiodegradable waste is
Person who is colour-blind cannot distinguish between