Caption text gorge Credit NERC Key stages Key Stage 3 Key Stage 4 Key Stage 5 Higher Education Lifelong learning Themes Geology Wildlife Curriculum subject Geography Science Information on the formation of the Mendip Hills’ numerous dry valleys which deepen into spectacular gorges such as Cheddar, Ebbor, and Burrington Combe. Keywords dry valley gorge combe cavern collapse meltwater ice age Foundations of Mendip (British Geological Survey) – Dry valleys and gorges