silt
Silt is the smallest particle size of boulders, pebbles, sand, and silt. It is finer than sand, pebbles, and boulders, which allows it to settle at the bottom first when suspended in water and has a low settling velocity.
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Pebbles settle faster than sand grains due to their larger size and weight. The larger surface area of the pebbles and their higher density allow them to fall more quickly through the surrounding fluid. Sand grains are smaller and less dense, resulting in slower settling rates.
Pebbles generally sink faster than sand due to their higher density and larger size. Sand particles are smaller and lighter, so they tend to float or settle more slowly in water compared to denser pebbles.
Generally, clay particles are smaller and lighter than silt particles, so they tend to stay suspended in water longer. Silt particles are larger and heavier, causing them to settle faster in comparison to clay particles.
Sand settles faster than pebbles and clay. Sand particles have smaller size and lower density, allowing them to quickly compact and settle in a sedimentation process. Pebbles are larger and denser, while clay particles are very fine and may take longer to settle due to their tendency to remain suspended in water.
boulders
More silt is typically found in flatlands compared to mountains. Flatlands have more opportunity for sediment deposits to accumulate and settle, while mountains have rough terrain and faster water flow that can carry away silt more effectively.
Boulders settle first, followed by pebbles, then sand. This is because boulders are the heaviest and tend to settle fastest, while sand is the lightest and takes longer to settle.
Pebbles, because it takes for energy for the pebble to sink and so the pebbles are hevier and sink faster then the sand grains
Sand would settle first, as it has the smallest particle size and can easily compact together. Boulders, being the largest, would settle last due to their size and weight. Pebbles would settle between sand and boulders in terms of settling time.
Boulders-cobbles-pebbles-sand-silt-clay