NASA has released an overhead photo of the rare ring dike complex in South Africa’s Pilanesberg National Park; the geological structure of concentric circles is the result of a series of ancient volcanic eruptions.
South Africa’s Pilanesberg National Park is known for its wildlife, but it is also home to a unique geological feature.
According to NASA, the area contains “one of the world’s largest and best preserved alkaline ring dike complexes.”
Ring dikes are rare structures on Earth that are formed after numerous cycles of volcanic eruptions cause magma to fill underground cracks that end up in the shape of concentric circles.
Last month, one of the land observing image
