Coral Reefs Quiz

What percentage of the ocean do coral reefs make up?

• 10%

• Less than 1%

• 25%

• 50%

What are corals?

• Plants

• Minerals

• Rocks

• Animals

How many people rely on coral reefs for food?

• 100 million

• 250 million

• 500 million

• 1 billion

At what depth do coral reefs generally grow best?

• Shallower than 70 meters

• At 200 meters

• Deeper than 100 meters

• At 500 meters

What happens to corals when the ocean gets too warm?

• They turn black

• They turn white

• They grow faster

• They disappear

How do coral reefs help during storms?

• They produce heat

• They create waves

• They act as a barrier

• They attract fish

Why do coral reefs need clear water?

• To see fish

• To grow faster

• To photosynthesize

• To attract tourists

How many people visited coral reefs each year before COVID-19?

• 25 million

• 71 million

• 10 million

• 50 million

How old are established coral reefs today?

• 1,000 - 2,000 years

• 3,000 - 4,000 years

• 5,000 - 10,000 years

• 10,000 - 20,000 years

In what temperature can deep sea corals be found?

• 10ºC

• 30ºC

• 4ºC

• 20ºC