Different types of rock can be found in different parts of the country. Limestone, which is also called Portland stone, is used in buildings such as the Bank of England. Rocks are removed from the ground by using explosives or by cutting with saws.

This clip is from:
Science Clips, Rocks and Soils
First broadcast:
9 October 2007

After watching the clip, children could start to consider coastal erosion and how and why cliffs are formed. They could consider why cliffs around the north Cornish coastline (made of hard rock like basalt) look very different to the cliffs around Dover (made of soft rock like chalk). Children could be shown images of these cliffs and consider the environmental impact on the people who live around these areas. Children could be set a task, in which they are presented with two houses for sale: one on a Cornish cliff and one on a cliff in Dover. They have to provide a statement about which house they would recommend buying, and why. They could also begin to think about how coastal erosion could be prevented or slowed down (eg use of 'groynes' or 'rock armour', or methods which prevent the sea directly impacting the cliffs).