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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Angle of repose | 2/2 | https://en.wikipedia.org/wiki/Angle_of_repose | reference | science, encyclopedia | 2026-05-05T13:35:03.286148+00:00 | kb-cron |
Here is a list of various materials and their angle of repose. All measurements are approximated.
== With different supports == The below media illustrates that while different supports modify the shape of the pile, the angle of repose of the material in question remains the same:
== Exploitation by antlion and wormlion (Vermileonidae) larvae ==
The larvae of the antlions and the unrelated wormlions Vermileonidae trap small insects such as ants by digging conical pits in loose sand, such that the slope of the walls is effectively at the critical angle of repose for the sand. They achieve this by flinging the loose sand out of the pit and permitting the sand to settle at its critical angle of repose as it falls back. Thus, when a small insect, commonly an ant, blunders into the pit, its weight causes the sand to collapse below it, drawing the victim toward the center where the predator that dug the pit lies in wait under a thin layer of loose sand. The larva assists this process by vigorously flicking sand out from the center of the pit when it detects a disturbance. This undermines the pit walls and causes them to collapse toward the center. The sand that the larva flings also pelts the prey with loose rolling material that prevents it from getting any foothold on the easier slopes that the initial collapse of the slope has presented. The combined effect is to bring the prey down to within grasp of the larva, which then can inject venom and digestive fluids.
== In geotechnics ==
== See also == The angle of repose plays a part in several topics of technology and science, including:
== References ==