− | [[File:1024px-Limestone Formation In Waitomo.jpg|400px|thumb|A limestone formation in the Waitomo District of New Zealand. Photo by [[Ingolfson]].]] | + | [[File:1024px-Limestone Formation In Waitomo.jpg|400px|thumb|A limestone formation in the Waitomo District of New Zealand. Photo by [https://commons.wikimedia.org/wiki/User:Ingolfson Ingolfson].]] |