The fact that it was occurring on people's driveways, alongside the motorways and nearly underneath people's houses was terrifying for some to understand.
The 15ft deep sinkhole closed the M2 motorway near Kent.
These sinkholes occur after heavy rainfall. Rainfall seeps through the soil absorbing carbon dioxide and reacts with decaying vegitation, creating a slightly acidic water. Water moves through spaces and cracks underground, slowly dissolving limestone and creating a network of cavities and voids. As limestone dissolves, the pores and cracks are enlarged and carry more acidic water.
Sinkholes are therefore formed when land surface above collapses or sinks in to the cavities, or when surface materials is carried downward in to the voids.
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