Nothing but if the pebble is raw it can have changes in size the longer it stays in a liquid.
someone picks it up and puts it in a river, then the river turns it into a pebble with erosion.
The smallest type of rock is a pebble. A pebble can be made out of most rocks and is the size of a marble.
No creeks are not rivers
Yes
yes it cann
It is not necessarily any of these, as "pebble" describes a grain size and does not say anything about composition. In most cases, though, a pebble is a mixture.
4
6.4 centimeters in diameter.
The size of the pebble will decrease down stream because the further downstream you go the quicker the river velocity. This means there will be more abrasion against the sides and bed of the river and the friction will be greater, this wears away the river load making it decrease in size. Increase velocity means that bigger material will be picked up by the river and carried as river load. More load in the river and increased size of load will mean more attrition and the river load will keep colliding into each other smoothening and rounding their shape. Brap brap !!
Pebble larger than clay
Meteroids' can be very big or very small. There is no exact size of a meteroid.
someone found the true meaning of a pebble