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The phrase "On earth" is correct and usable in written English.
It can be used to emphasize a point or express disbelief, often in rhetorical questions or exclamations.
Example: "What on earth were you thinking when you made that decision?"
Alternatives: "In the world" or "On this planet".
Dictionary
On earth
adverb
Expletive used for emphasis after an interrogative word.
Exact(60)
We are on earth.
Heaven on earth?
What on earth?
Sexiest place on earth.
What on earth happened?
With everyone on earth.
landing on Earth.
By anyone on earth.
Why on earth not?
How on earth.
Why on earth?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com