The fluid with entrained particles is illuminated so that particles are visible. In addition to entrained air, hardened concrete also contains entrapped air. Once entrained by the wind, particles were then deposited downwind. Settling basins are ponds constructed for the purpose of removing entrained solids by sedimentation. The droplets are entrained in a gas stream and delivered to the print head. This motion results from fluid being entrained by moving motor molecules of the plant cell. These considerations ignore further the risks associated with large debris entrained by the flow motion. Embedded in the granite are xenoliths or pieces of foreign rocks entrained in the magma. The frozen air can then be entrained into a trailing vortex behind the entry vehicle. This is when small entrained air bubbles compress and superheat with rapid rises in pressure. Some ring-liquid is also entrained with the discharge stream. These are larger bubbles, and are typically less evenly distributed than entrained air. Both entrained to external light cues, but were largely arrhythmic in constant conditions. As it is entrained, it cools and acts a heat shield for the surface layer. These are normally best as deaerators, which means they are best at releasing entrained air.