When I play an Earth site using the second ability, do I also place a rubble in an adjacent void?
No. You only place a rubble if you play an Earth site using the first ability.
When I play an Earth site using the first ability, where does the rubble appear?
The rubble must be placed adjacent to your Geomancer. If there's no void adjacent to your Geomancer, then no rubble is placed.
Does Mirror Realm (copying an earth site), Valley of Delight (choosing earth), or one of the Bloom sites (i.e. Twilight Bloom) count for Geomancer's first ability?
If Geomancer creates a Rubble adjacent to Boulevard of Bones, do they create a skeleton?
No, the rubble is created in place, not played.
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