[blam]

"Ok, so why didn't the monument and buildings sink too? "

I wondered the same as I read it.

[Arizona Carolyn]

Isn't it basically the same as Florida and the sinkholes they contend with? The sinkholes come from draining the aquifers. At least here, in the US, we've learned and make an effort to recharge our aquifers... at least the two largest aquifers....