You might have seen in the movies in which earth suddenly opens up and eats up whole building or cars. But this can actually happen because of a phenomena called Sink Holes. Sink hole are different than just holes in ground they can big and deep. 
The formation of sink holes is directly related to the water. It is formed due to exposure to water. There are two parts to a sink formation viz. type of rock underlying the soil(The soil is called overburden which is topmost layer.) and Acidic water which seeps into bedrock. The sink holes are prominent where the underlying rocks are formed of minerals like gypsum, salt, limestone, dolomite or other carbonate classes of rocks.
It starts with acidic water interaction with the bedrock slowly eroding it. The water becomes acidic when it absorbs carbon dioxide which makes carbonic acid. As this water erodes it creates conduits or underground tunnels for water. Sometimes even lack of water causes sink holes because if the water body in the underground cavern which was holding the earth above depletes then there we have a sink hole.
Sink Holes Are common in United States of America. Sink holes can be attributed to humans too. A broken pipe weakening its surrounding pipe by injecting excess water and thus creating a sink hole.
Enjoy reading and be open to the things that world has to offer.
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