article: Impact crater
links: South Australia Spain Earth Cambrian Moon Western Australia NASA Australian impact structure Chicxulub crater Implication (grammar) Acraman crater South Africa Neoproterozoic Antarctica Australia Canada Matrix (geology) Estonia Sudbury Basin USA Popigai crater India Indian Ocean Vredefort crater Mexico Kazakhstan Quebec Northern Territory North Polar Basin (Mars) Russia Manicouagan crater Ontario South Pole–Aitken basin Late Heavy Bombardment