They didn't. They were formed over millions of years from the bodies of dead crustaceans.
One metre every six years.
aprox 350,000 people visited in 2010
The chalk cliffs at Dover and on the opposite side of the English Channel have been continually eroding since the last glaciation, at which time the English Channel was a river valley and the southern North Sea was land. When the ice melted, the southern North Sea flooded and burst through the gap causing a catastrophic flood, which started the main erosion of the chalk cliffs and it has widened ever since.
208 was the Battle of the Red Cliffs
the year was 208
the year was 208
the year was 208
208 and 209
Winter Of 208/9
208-209 AD.
Battle of Red Cliffs (Battle of Chibi) in 208/9 CE ended the Han Dynasty in China.
208-209 AD.