Chalk cliffs are steep rock formations made primarily of chalk, a soft, white limestone composed of tiny marine organisms. These cliffs are often found along coastlines, where erosion from waves and weathering creates dramatic vertical faces. The most famous chalk cliffs are located in England, particularly the White Cliffs of Dover, which are a symbol of the country. The chalk in these cliffs is formed from the accumulation of microscopic shells and skeletons over millions of years. Over time, natural processes like erosion and landslides can reshape these cliffs, making them dynamic geological features. They also provide unique habitats for various plants and animals, contributing to local biodiversity.