In which scenario would a marble NOT cause a significant water displacement?

The scenario in which a marble would not cause a significant water displacement is when the marble is made of plastic. This is because the density of the marble plays a crucial role in determining whether it displaces water effectively. A plastic marble typically has a lower density compared to a glass or metal marble, meaning that it will displace less water when submerged.

In contrast, in small volumes of water, a very small marble, or a graduated cylinder filled to the top, water displacement can still occur, and these scenarios generally result in water being displaced by the volume of any object submerged, including a marble regardless of material.