Pebble
Scientific Name: N/A
Category: rock
Brief Description
A small, rounded stone held in a hand, typically smoothed by the action of water or wind over time.
Characteristics
Smooth, weathered surface with a greyish-green speckled appearance, rounded edges, and compact size fitting comfortably in the palm of a hand.
Habitat
Found globally in riverbeds, lake shores, beaches, glacial deposits, and gravel bars.
When to Find It
N/A
Conservation Status
N/A
Ecological Role
Pebbles and gravel beds provide essential microhabitats for aquatic macroinvertebrates, spawning sites for various fish species, and anchoring points for mosses and lichens.
Easily Confused With
Man-made tumbled glass or synthetic ceramic beads; can be distinguished by mineral composition, natural grain, and geological origin.
Observation Tips
Look along riverbanks and shorelines after heavy rain or low tide when water movement reveals freshly washed stones.
Interesting Facts
The rounding of a pebble is primarily caused by abrasion as stones collide with one another in moving water during transport downstream.