It's not caused by erosion. Instead, the rock, itself, forms the arch and the erosion just washes away everything else around it. Read the rest
Maggie Koerth-Baker, Boing Boing
Tue, 07/22/2014 - 8:18pm
It's not caused by erosion. Instead, the rock, itself, forms the arch and the erosion just washes away everything else around it. Read the rest