Final answer:
In particle size classifications used in geosciences, 'Bubble' is not included; rather, sand, silt, and clay are established categories recognized and plotted on a triangular (ternary) graph (A).
Step-by-step explanation:
Within the context of particle size classifications in geology, sand, silt, and clay are commonly recognized categories. Sedimentologists use a triangular plot, also known as a ternary plot, to classify sediments based on their proportions of these three sizes.
By using this classification system, each type of sediment can be identified as having particular characteristics and behaviors, such as clayey sand (CS), sandy clay (SC), or clayey sandy silt (CSSt). The option bubble does not fit into this classification scheme as it is not a type of particle or sediment but a term generally associated with gas cavities in liquid or solid materials.
Therefore, in the context of particle size classifications in geosciences, Bubble is not included, as it is not part of the sediment's grain size but rather a different concept altogether.