Sorry, it's not possible for many reasons...

There may be large geodes within the Earth, but that's about it...

Think about it; the Earth and other planets were formed violently. Upon the creation of our solar system the Earth was completely molten. The heavier elements sank to the center of the Earth to form our core. The rotation of our core gives us our magnetic field...

If the Earth were hollow then a cosmic collision would simply punch a hole in the Earth. That doesn't happen...

However, you could compare the Earth to a very large electric generator/DC motor...