Related Clues:
- Silver or sulfur
- Gold or silver, but not bronze
- Helium or hydrogen
- Euclid work
- Gold, e.g.
- Mendeleev's tabulation
- Periodic-table listing
- Thallium and mercury, e.g.
- 21-Down, e.g.
- Basic principles of the weather
- First principles of the weather
- A first principle, found in a kettle?
- Constituent parts
- Components, factors
- Essential parts or the weather