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Big round (ages 12 and up): 🌊 The ocean. Ten questions. Tap a box to see the answer.
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The ten, for a host reading aloud
- 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
🔑 Show the answers
- B: copper. The protein is called haemocyanin; human blood uses iron-based haemoglobin. Source: Natural History Museum, London
- C: Prochlorococcus. Most of the ocean's oxygen comes from drifting plankton like this. Source: NOAA Ocean Service
- A: calcium carbonate. Most stony coral polyps are only one to three millimeters across. Source: NOAA Ocean Service
- B: the Challenger Deep. It lies at the southern end of the Mariana Trench in the western Pacific. Source: NOAA Ocean Service
- A: about 3,000. It stretches for about 1,429 miles off the coast of Queensland, Australia. Source: NOAA Ocean Service
- B: new moon and full moon. The name comes from the tide 'springing forth,' not from the season. Source: NOAA Ocean Service
- B: the temperature of the eggs. Scientists call this temperature-dependent sex determination, or TSD. Source: NOAA Ocean Service
- B: about 3,682 meters. That is about 12,080 feet, more than two miles down. Source: NOAA Ocean Service
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