Quote Originally Posted by HorizonWalker View Post
The Elemental Plane of Earth doesn't have a surface. It's an endless expanse of caverns and rock.

As for its resources, either they're as infinite as the plane is, or they're incredibly rare to the point of practically not existing, due to the nature of infinity. Considering that the major roadblock to "why don't they just mine out the Plane of Earth?" is "do you know how hard it is to find a ninth-level cleric willing to burn their highest-level spell slots ferrying rocks and miners back and forth?" I think most designers will shrug and say "Yeah, it's infinite resources, they're just hard to get to."
Not to mention Earth Elementals fighting back at people who are kidnapping their children.