Description : I mean those round stones. Does it arise on its own? Or is it created by man?
Last Answer : "It arises on its own in nature" - a stone (pebble) simply rotates in a watercourse under the influence of a water stream and rubs against the surrounding stones (pebbles) until (and so thoroughly) it becomes a pebble. : o "man" - do you think that a person is sitting by a stream and playing ??? : D