Fact 1: Sinkholes are formed by precipitation.

Fact 2: Eventually, the sinkhole collapses into cavern.

Given the two facts above, answer the question "Precipitation filling an underground void can create what?" with the following options: 
- clouds
 - soils
 - cavern
 - electricity
 - mountain
 - rain
 - rivers
 - flooding


 

   cavern      