And the level after that is making the distinction between "earth" and "Earth".

And before the quartic pedants say "well, all earth is on Earth", there's some in planes, on the space station and probably a few molecules scattered by impacts and human space exploration.

Quintic pedants will then question if, after being in space environments for long enough, a scrap of outgassed irradiated earth is still properly called earth? So isn't all "real" earth still gravitationally bound to the Earth?

Sextic pedants may be the first to notice everyone else has left them to squabble and gone to the pub.