What does it mean to settle?

To settle refers to the process of falling into a certain level and arrangement, often as a result of gravitational forces acting on particles. This term is commonly used in scientific contexts, such as in sedimentation, where particles suspended in a fluid come to rest and form layers at the bottom due to gravity. This process illustrates how materials organize themselves over time, leading to a stable configuration.

The other options may describe different processes or states. For instance, growing in size implies a change in volume rather than the arrangement of particles. Similarly, becoming agitated describes a state of increased activity or movement, contrasting with the idea of stability inherent in settling. Remaining stationary suggests a lack of movement but does not specifically encompass the process of particles arranging themselves due to external forces. Thus, the definition that captures the essence of settling most accurately is indeed the one that describes falling into a certain level and arrangement.