Science quiz
Science answers that start with O
Every answer on this board begins with O. The clues are a mixed bag: elements, units, planets, rocks, bones and whatever else the letter allows. Type the answers in any order.
- Format
- Type them all
- Items
- 13 answers
- Limit
- 3:15
- Level
- Medium
- Checked
- 2026.10.03
- Answers
- 13
- Time limit
- 3:15
- Order
- Any order
- Matching
- Case and accents ignored
- Type an answer; it files itself the moment it matches.
- One answer can fill several slots.
- Give up at any time to see what you missed.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Answer each science clue. Every answer starts with O.
| Clue | Answer |
|---|---|
| SI unit of electric resistance | Not found yet |
| Geological period that began 486.85 million years ago | Not found yet |
| Compound with the formula O₃ | Not found yet |
| Mineral that defines 6 on the Mohs hardness scale | Not found yet |
| Cranial nerve I: smell | Not found yet |
| A major moon of Uranus | Not found yet |
| Rank 5 of 8 in taxonomy, from broadest to narrowest | Not found yet |
| Clue | Answer |
|---|---|
| Layer of the Earth or its atmosphere: liquid, about 2,200 km thick | Not found yet |
| Element 8, symbol O | Not found yet |
| Cranial nerve II: vision | Not found yet |
| Element 76, symbol Os | Not found yet |
| Cranial nerve III: most eye muscles, eyelid and pupil | Not found yet |
| Element 118, symbol Og | Not found yet |
About this quiz
A mixed science round with one rule: the answer always starts with O. Knowing the first letter helps more than you might expect, and less than you would like.
- There are 13 clues on this board, 3 of them for chemical elements.
- Element clues give the atomic number and the symbol.
- Spelling is forgiving about capitals, accents and hyphens, and both British and American element spellings are accepted.
Sources
- [1]National Institute of Standards and Technology. SP 330: The International System of Units, section 2.
- [2]BIPM. The SI.
- [3]PubChem, National Institutes of Health. PubChem compound database.
- [4]U.S. National Park Service. Mohs Hardness Scale.
- [5]U.S. National Library of Medicine. Medical Subject Headings: Cranial Nerves.
- [6]National Cancer Institute, SEER Training. The peripheral nervous system.
- [7]NASA. Jupiter moons.
- [8]NASA. Saturn moons.
- [9]NASA. Uranus moons.
- [10]NASA. Neptune moons.
- [11]NASA. Moons of our solar system.
- [12]U.S. Geological Survey. This Dynamic Earth: Inside the Earth.
- [13]NASA. Earth's atmosphere: a multi-layered cake.
- [14]PubChem, National Institutes of Health. Periodic Table of Elements.
Last checked October 3, 2026
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