Nothing but if the pebble is raw it can have changes in size the longer it stays in a liquid.
The smallest type of rock is a pebble. A pebble can be made out of most rocks and is the size of a marble.
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.
No.
Pebble larger than clay
Meteroids' can be very big or very small. There is no exact size of a meteroid.
Zero. By definition a meteoriod cannot hit the earth. On a meteoriod enters the atmospehe it becomes a meteor amd when it hits the earth it is a Meteorite.
Smaller than that, even; the size of a grain of rice, or smaller.