Coral Reefs

What percentage of the ocean is taken up by coral reefs?

• 10-12 percent

• 25 percent

• less than one percent

• more than fifty percent

What percentage of the ocean's sea life lives in coral reefs?

• 10 -15%

• 20%

• 45%

• 25%

Coral reefs are endangered by

• climate change

• overfishing

• pollution

• all of the above

What causes coral bleaching?

• oil spills

• warmer water temperatures

• overfishing

• red tide

What is the largest coral reef on the planet?

• Rainbow Reef, Fiji

• Great Chago Archipelago, Indian Ocean

• Amazon Reef, Brazil

• Great Barrier Reef, Australia

What builds up over time to form a reef?

• Sand
• Coral skeletons
• Fish bones
• Rocks

Which of the following is NOT a type of coral reef?

• Fringing reefs
• Barrier reefs
  Barrier reefs
• Atolls
• Crustacean 

What is coral bleaching?

• When the sun heats up the water and the coral cannot withstand the high temperatures

• When people throw bleach into the ocean

• When a type of fish eats away at the coral, making it looked bleached.

• When the coral naturally dies,

What color does the coral turn when it is bleached?

• Blue

• Clear

• White

• All of the above

circular reefs formed when coral grows around islands that later sink beneath the surface of the sea is called ...

• atolls

• corals