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Figure 1

From: Natural Erosion of Sandstone as Shape Optimisation

Figure 1

Exotic geological formations. (a) Rainbow bridge arch in Utah, USA. (b) Sipapu Natural Bridge, Utah, USA. (c) Delicate arch in Utah, USA. (d) “Stone mushroom” pillar formation in Altai region, Russia. Image source - depositphotos.com. This figure is not covered by the CC BY licence. Image credits: Richard Semik (a), David Frederich (b), Richard Semik (c), Elena Gurdina (d). All rights reserved, used with permission.

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