These geometric patterns similar to man-made.
Regular annual freezing and thawing of the permafrost soil can create a very interesting geometric patterns – patterned soil.
These may be polygons, circles, nets and stripes. They usually occur in periglacial regions such as Siberia, Canada, Alaska, Iceland, Greenland, the Antarctic and the Andes.
The process of formation of such ornaments have long puzzled scientists but the introduction of computer geological models for the last 20 years has allowed them to link the formation of these patterns with the phenomenon of swelling of the soil from frost when wet, fine-grained and porous ground freezes.