Two sinkholes have appeared in the Surrey village of Godstone, but how have they formed and are they dangerous?

Some statues are made from marble too. Chalk is a soft rock and wears away easily. This makes it ideal for making chalk sticks to write on blackboards. Other rocks, such as slate, do not let water ...

One of the most common reasons for a sinkhole is when rocks like limestone or chalk break down. This happens because carbon dioxide from the air dissolves in rainwater to form carbonic acid - this ...