The following is a description of the innner earth from Olaf Jansen, and its the only one that we'll ever get, too.
Olaf Jansen:
There is a hazy mist that goes up from the land each evening, and it invariably rains once every twenty-four hours. This great moisture and invigorating electrical light and warmth account perhaps for the luxuriant vegetation, while the highly charged electrcal air and the evenness of climatic conditions may have much to do with giant growth and longevity of all animal life. In places the level valleys stretched away for many miles in every direction. "The Smoky God", in its clear white light, looked calmly down. There was an intoxication in the electrically sucharged air that fanned the cheek as softly as a vanishing whisper. Nature chanted a lullaby in the faint murmur of winds whose breath was sweet with the fragrance of bud and blossom.
http://www.holloworbs.com/the_smokey_god.htm
