See all these Wiki links for explanation.
https://en.wikipedia.org/wiki/Circuit_court
https://en.wikipedia.org/wiki/United_States_courts_of_appeals
https://en.wikipedia.org/wiki/United_States_circuit_court
https://en.wikipedia.org/wiki/Circuit_judge_(England_and_Wales)
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Federal Circuit Court of Appeals judges are appointed for life and can only be removed via impeachment.
In the U.S., it varies by state. Federal judges are not elected; they are appointed.
Judges at the provincial level are appointed by the premiere
Adams appoints judges
For federal judges, the answer is Congress. Federal judges can be impeached by the House of Representatives and tried by the Senate.