Question
The small features that cover the surface of the Sun are named for their resemblance to these materials. For 10 points each:
[10h] Name these materials that form mounds that collapse when above the angle of repose, which equals the arctangent of the coefficient of friction.
ANSWER: granular materials [accept solar granules; prompt on grains]
[10e] A "granular" analog of this process causes large particles to rise in the Brazil nut effect. The main modes of heat transfer are conduction, radiation, and this process.
ANSWER: convection [accept granular convection]
[10m] With "convection," this word describes moving bodies of fluid such as solar granules. Circulation in the Earth's atmosphere occurs within structures named for this word and "Hadley," "Ferrel," or "polar."
ANSWER: cells [accept convection cells or Hadley cells or Ferrel cells or polar cells]
<Science - Physics>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2025 PACE NSC | 06/07/2025 | Y | 42 | 17.38 | 100% | 67% | 7% |