system
Given the following post, respond as if you're commenting on Reddit:
human
[Fullmetal Alchemist:Brotherhood] In FMA:B, it’s stated that to use alchemy, people draw on the energy of moving magma in the mantle IIRC. Shouldn’t that eventually slow down and stop the movement of plate tectonics?
gpt
The heat given off is lost anyway; their alchemy is just using it rather than bleeding it uselessly off into space. Plus, each individual transmutation uses so very little that it would take longer to "use up" the planet than it would for the sun to die and consume the planet (assuming Earth-like conditions in all other ways).