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greatninja3 This series isn't for you if you can't be creative with filling in the things that don't seem right.
For example, perhaps the superhuman high schoolers are from a dimension very similar to ours, but with a different version of humanity which has more variance between its average and its amazing people.
Maybe the world they ended up in is a place where mana manipulation can occur thus stifling technological progress (who needs it?).
Maybe this magical world has a completely different genesis to ours. Like a far greater number of collisions in the early part of the solar system due to a different planetary arrangement, causing more high-density material to be close to the surface. Then again, maybe that's not it either. Maybe the flow of mana caused the metals in the core to mix more readily with the crust material as the planet cooled?
Filling in the gaps in the writing is another way to enjoy something IMO.