Julio wants to find the volume of a small pebble. He drops it into a graduated cylinder filled with 30.0 mL of water.

A pebble’s volume can be found by water displacement: record the water level before and after submerging the pebble, then subtract the initial volume from the final volume. The difference is the pebble’s volume, so the correct choice is calculating water displacement.

AI-written and checked against the verified answer.