I had an idea for an alien world I want to set a story on and if this question proves popular I might ask other questions regarding this world.
The world in question is an earth like moon orbiting a gas giant. The moon is earth like in the sense that it’s about the same size and gravity, oxygen nitrogen atmosphere, and plenty of water to support a vibrant biosphere, but that’s where the similarities pretty much end.
Much like Io, this moons proximity to its parent gas giant planet means that the tidal forces creates friction in the core as it orbits, fueling the moons unreal volcanic activity. While a great deal of the planet resembles the Danakil Depression, blood red soil interrupted by vibrant hot springs filled with various extremophile microbes, other areas of the planet are far more like Yellowstone National Park were there are still plenty of hot springs and geysers, but also an abundance of plant and animal life.
I was trying to figure out how the biosphere might work on this alien world one thought stuck out to me that I am having some difficulty trying to answer on my own.
What color would the plants be?
I don’t want the plants to be green because then it might be a little too earth like. And I am man enough to admit I don’t know enough about volcanic material and how plants would incorporate the various gases and minerals and how that would affect color.
So my question is: What color would plants be on an geologically active hot spring planet?