I would say it was made by god himself since he is one of the most common supernatural beings but since u said the key word ''how'' it was used by supernatural abilities that normal organisms like us don't posses, or the earth was made by the so call big bang theory of where scientist believe that a meteor, asteroid or comet u may say, came and it created the earth and brought all of us here, like the expression ''BOOM'' as in so suddenly, or even that mother nature herself just brought us here.
