In the world that I am making there are hollows all over the planet, which are massive underground subterranean areas of the planet. Think The Hollow of the Gears Of War series. So far the going theory on how they formed was underground rivers, natural cave systems, old volcanic tubes, and things of that nature besides burrowing animals of old.
In order to solve the problem of light and heat my friend and I created Hearthstones, which are Biominerals, that feed on heat, light, and ambient radiation in order to survive. Now the Hearthstones have a feeding and heating phase where they are black and are cold to the touch when absorbing energy, and release light and heat when they aren't. The reason we did this was to make it so that the Hearthstones could keep their environment within a mean of 58 to 72 degrees for ideal environmental conditions to feed. We have talked in depth how this system might work but have run into several roadblocks concerning this. Mainly how it would function and be realistic.
So with this in mind, here are some road blocks my friend and I have run into.
- Due to the changes in temperature in the hollows due to the Hearthstones would there be wind currents in them?
- Would the presence of summer/ winter affect the hollows, making them opposite to the surface season since the ground would be colder/ warmer in the respective seasons?
- Is the system I have suggest feasible or would it need an outside source as well like magma flows or the like?