Back Tormo AN جلمود Arabic Valun Azerbaijani Валун Byelorussian Валун BE-X-OLD Валун Bulgarian Bloc (roca) Catalan Катрам CV Felsblock German Ογκόλιθος Greek
In geology, a boulder is a large piece of rock fragment that is larger than 25.6cm or roughly 10.1 inches in diameter or with a size value less than -8 on the φ particle size scale with no upper size limit.