The rules of Baseball do not specify the area of the mound, only the height and the placement. In general, they are approximately a 10 foot circle.
There is no height difference. A softball mound is not raised like a baseball mound.
Pitchers mound
No
to legally play only one person can be on the pitchers mound while the game is in play
The diameter of an MLB pitcher's mound is 18 feet.
YES
Measure from the front edge of the pitching rubber to the back tip of home plate.
second
60'6"
Yes.
More than likely a pitcher's mound is removed by smoothing the dirt out with a bulldozer.
The mound allows pitchers a much better chance of pitching within the strike zone.