Natural sinkholes generally form when heavy, water-saturated soil causes the roof of an underground limestone cavity to collapse, or when water widens a natural fracture in limestone bedrock.

一般自然灰岩坑形成机理是由于有份量的水饱和土导致地下石灰岩洞顶层坍塌，或者由于水加宽了石灰岩床的天然裂缝而导致。

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All fibrous formations form from saturated solutions being squeezed out of pores in the bedrock (usually limestone) and depositing at they hit air.

所有纤维状沉积物都是由基岩(通常是石灰岩)的孔隙中受压的饱和溶液形成的，当他们遇到空气，就结晶沉积下来。

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Florida lies on bedrock made of limestone or other carbonate rock that can be eaten away by acidic groundwater, forming voids that collapse when the rock can no longer support the weight of what's above it.

CNN: Sinkhole eating family out of house and home

The state lies on bedrock made of limestone or other carbonate rock that can be eaten away by acidic groundwater, forming voids that collapse when the rock can no longer support the weight of what's above it.

CNN: Home of Florida man devoured by sinkhole to be demolished