Of course no spider aliens as the clickbait might insinuate.

These are cracks in the ice sheet caused by gases which when released to the surface bring dark material with them is spread on the ground in that manner.

Sunlight causes the carbon dioxide ice at the bottom of the layer to turn into gas, then build up and break the ice sheets on it. The gas explodes in the spring on Mars, dragging dark material to the surface over time and destroying the ice layer as thick as a meter."

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