Boulder-sized clasts are found in some sedimentary rocks, such as crude corporation as well as rock clay. In geology, a boulder is a rock piece with dimension greater than 256 millimetres (10.1 in) in diameter. While a stone might be little sufficient to relocate or roll by hand, others are exceptionally massive. Alike use, a rock is also large for an individual to move. Smaller rocks are typically just called rocks (American English) or rocks (In British English a rock is bigger than a rock).