Geological phenomena
Geological phenomena can be found on some planets across the galaxy. Several different types of Volcanism has been discovered on planets and moons without atmospheres.

Types
There are several known types of Geological Phenomena:
Protrusions
Geological sites feature various protrusions that can be mined for certain raw materials. The actual materials produced depend on the composition of the planet they are on:
Gallery
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Silicate Fumarole
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Silicate Vapour Gas Vent
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Ice Geyser on Europa