Topic
boulder.
natural rock fragment larger than 25.6 cm in diameter (larger than 200 mm diameter according to ISO 14688)
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About boulder
In geology, a boulder is a rock fragment with size greater than 25.6 cm (10.1 in) in diameter. Smaller pieces are called cobbles and pebbles. While a boulder may be small enough to move or roll manually, others are extremely massive. In common usage, a boulder is too large for a person to move. Smaller boulders are usually just called rocks or stones.
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