How, why, where, who, etc. on earth
Definition 1 of 2
Pro Tip 1/3Expressing Surprise
Use it when something is incredibly surprising or difficult to believe. 
Where on earth did you find that rare book?
Pro Tip 2/3Highlighting Confusion
Shows you're confused and seeking an explanation for something unusual. 
Why on earth would they cancel the event at the last minute?
Pro Tip 3/3Emotional Emphasis
Adds emotional weight to your question, showing strong feelings. 
How on earth could you say something so hurtful?
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