Smaller than pebbles:
* Grit: Very small, angular rock fragments.
* Sand: Fine, loose rock particles.
* Silt: Even finer than sand, almost like dust.
* Clay: The smallest rock particles, so fine they can feel smooth like powder.
Similar size to pebbles:
* Cobble: Larger than a pebble, but smaller than a boulder.
* Gravel: A mixture of pebbles, cobbles, and sometimes larger rocks.
Other terms:
* Shard: A broken piece of rock, often with sharp edges.
* Chip: A small piece of rock, often broken off a larger piece.
The exact size of a pebble can vary depending on the context, so the best way to describe a small rock is to use a specific size comparison, like "smaller than a pea" or "about the size of a marble."
