Something that is done by people many times, so that it becomes part of their culture
tradition
To go to a place to see something or somebody
visit
liked by many people
popular
Done by somebody (usually a survey or exploration)
conducted
Many kinds of something
variety
A number or amount going down
declining
Probably going to happen
Likely
Explaining why something happened
Reason
Appears to be
seems
Roughly or approximately
Around
