Fairy circles are round gaps in arid grassland distributed very uniformly, only occurring in southern Africa and Australia. Various theories circulate about cause. A new study suggests that fairy circles in Australia are caused by weathering of soil by heavy rainfall, extreme heat and evaporation.

See the source article by following the link below:
Fairy circles are round gaps in arid grassland distributed very uniformly, only occurring in southern Africa and Australia. Various theories circulate about cause. A new study suggests that fairy circles in Australia are caused by weathering of soil by heavy rainfall, extreme heat and evaporation.