Returning the land via earhtbending is not an ability granted to the land. It is a delayed trigger set up by the resolving spell/ability that earthbended it in the first place. That delayed trigger is simply waiting for the trigger event to occur and then triggers.

603.7. An effect may create a delayed triggered ability that can do something at a later time. A delayed
triggered ability will contain “when,” “whenever,” or “at,” although that word won’t usually begin
the ability.

701.66a “Earthbend N” means “Target land you control becomes a 0/0 land creature with haste in
addition to its other types. Put N +1/+1 counters on it. When that land dies or is put into exile,
return it to the battlefield tapped under your control.”