Graphic looking at a sinkhole in Germany
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Global sinkholes explained - in 60 secs

A brief look at some of the biggest sinkholes in recent history.

Sinkholes are created when the surface layer of the ground collapses.

They vary in size and are found all over the world.

This is a brief look at some of the biggest sinkholes in recent history and the various causes that can lead to these chasms in the ground.