A president about to leave office is referred to as a "Lame Duck" president.
Impeached
suck my a**
No. If the president is found guilty by 2/3 of the Senate, he is stripped on his office and is no longer President . ( I suppose, however, that some might still call him "President".)
The President of the United States works out of the Oval Office.
It is called filtration.
digestion
Inauguration
It is called rationalising the denominator.
President-elect
it is called Inaugaration Day
Mining is the process of removing nonrenewable resources like iron and copper from the ground.