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6:37 AM
@JohnRennie hi
 
Hi :-)
 
sir what cause cyclone
 
I have no idea! :-)
 
ok sir I did some research
 
Isn't it due to hot water in the ocean causing air to rise?
 
6:38 AM
yes sir
 
It's probably easy to Google. I imagine Wikipedia will have an article covering this.
It's just not something I've ever researched.
 

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