Who explored the sources of the Mississippi River and wrote about the lifestyles and folklore of the American Indian?
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Delhi is the capital city of India. Due to this reason, the city is overcrowded.
A large number of vehicles can be found in the roads of Delhi.
The poisonous gases emitted by these vehicles causes harm to our environment.
It causes smog and global warming. Huge numbers of industries are also in the city.
The gases emitted from the factories also cause air pollution in Delhi.
It causes various health hazards to the children and elderly people like asthma etc.
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