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Big round (ages 12 and up): The ocean. Pages: the ten question cards, two answer sheets to a page (print one page per two teams), and the key on the last page, to fold back.
1. Octopus blood is blue because its oxygen-carrying protein contains which metal?
- A. silver
- B. copper
- C. iron
2. Which tiny ocean bacterium, the smallest photosynthetic organism on Earth, makes up to 20% of our oxygen?
- A. Lactobacillus
- B. Streptomyces
- C. Prochlorococcus
3. Stony coral polyps build reefs from skeletons made of what?
- A. calcium carbonate
- B. silica
- C. keratin
4. What is the deepest known part of the ocean called?
- A. the Java Trench
- B. the Challenger Deep
- C. the Puerto Rico Trench
5. The Great Barrier Reef is made up of nearly how many individual reefs?
- A. about 3,000
- B. about 30
- C. about 300,000
6. Spring tides happen around which phases of the moon?
- A. first and third quarter
- B. new moon and full moon
- C. waxing and waning crescent
7. In most sea turtles, what decides whether a hatchling is male or female?
- A. the size of the eggs
- B. the temperature of the eggs
- C. the phase of the moon
8. What is the average depth of the ocean?
- A. about 368 meters
- B. about 3,682 meters
- C. about 36,820 meters
Team: ______________________
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Team: ______________________
| 1 | ABC |
| 2 | ABC |
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| 4 | ABC |
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The key (for the host: fold this page back)
- B: copper. The protein is called haemocyanin; human blood uses iron-based haemoglobin.
- C: Prochlorococcus. Most of the ocean's oxygen comes from drifting plankton like this.
- A: calcium carbonate. Most stony coral polyps are only one to three millimeters across.
- B: the Challenger Deep. It lies at the southern end of the Mariana Trench in the western Pacific.
- A: about 3,000. It stretches for about 1,429 miles off the coast of Queensland, Australia.
- B: new moon and full moon. The name comes from the tide 'springing forth,' not from the season.
- B: the temperature of the eggs. Scientists call this temperature-dependent sex determination, or TSD.
- B: about 3,682 meters. That is about 12,080 feet, more than two miles down.
Every answer checked at its source. Play this round on a screen: peabody.kids/trivia/round?r=b3.tsea.s50428