Answers

2016-03-05T21:20:34+05:30
A conversation means the chat or talk that we are doing with someone (its continuous talk) 
Example: our conversation on that topic took an hour
mean - our continuous talk on that topic took an hour 
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2016-03-05T21:25:22+05:30
The process of changing or causing something to change from one form to other 
 ex :  ice changes to water.
water changes to solid by freezing.

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