The white cliffs of Dover are composed of chalk.
Calcium carbonate, specifically chalk.
chalk
The type of rock would be igneous.
basalt
sedimentary
The type of rock that makes up most of the Earth's crust is igneous. It is the most common rock type because it has been forming billions of years ago, along with most formations on Earth.
rock
Limestone.
mineral
Erosion It is when the sea bashes up against the cliffs wearing the rock away. This shapes the coast because it makes it smaller.
sand makes up a nipekamew sand cliff because of all its sand, the sand gets blown around and builds up to make the sand cliffs.