"Araneiform terrain" is the scientific term for the surface spiders. They appear as the sun returns to Mars' South Pole. As the warm solar rays heat the surface, carbon dioxide ice beneath the surface begins to sublimate, turning from a solid to a gas.
When local pressure mounts inside the subsurface ice cap, pockets of gas can explode upwards, exploding dust in all directions and leaving a spider-like blast signature on the ground.
The seasonal geological process is unique to Mars' South Pole and not found anywhere on Earth.
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