Chalk pyramids are geological formations made primarily of chalk, a soft, white, porous sedimentary rock. These structures often appear as steep, pyramid-like hills or cliffs, formed through the erosion of surrounding materials. They are typically found in regions with significant chalk deposits, such as parts of England and France. The formation of chalk pyramids occurs over thousands of years, as wind and water erode the softer rock layers, leaving behind the more resistant chalk. These unique landscapes can provide habitats for various plant and animal species, contributing to local biodiversity and attracting tourists interested in natural wonders.