Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground.
Sinkholes are formed when the land surface above collapses or sinks into the cavities or when surface material is carried downward into the voids. Drought, along with resulting high groundwater withdrawals, can make conditions favorable for sinkholes to form.
9 I think
If I am wrong sorry
Answer:
is a service under the All India Services. ... Along with the Indian Administrative Service (IAS) and the Indian Forest Service (IFS), the IPS is one of the All India Services — its officers can be employed by both the Union Government and the individual states.