Study

Time Zones 4 - Unit 6 - Reading

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  • Why are coral reefs called underwater cities?
    Because 25% of all ocean species life in and on the coral reefs.
  • Where is the Great Barrier Reef?
    In Australia.
  • Why do polyps use calcium?
    They use it to build a hard limestone skeleton.
  • How do coral reefs protect the coast?
    They slow down waves and prevent erosion on the beaches.
  • What is the cause of coral bleaching?
    Global warming (warmer ocean temperatures)
  • How big is the great barrier reef?
    350.000 square kilometer
    250.000 square kilometer
    150.000 square kilometer
    450.000 square kilometer
  • What are the chemicals from reef creatures used for?
    They are used to make medicine.
  • What are coral polyps?
    Coral polyps are small creatures that build coral reefs.
  • What will happen in the future if we don't take good care of the coral reefs?
    Many experts believe that all coral reefs could be gone by 2050.
  • What does the text say about algae in coral reefs?
    They are good for the coral reefs.
    both
    They harm the coral reefs.
  • How much of the world's coral reefs is already dead?
    10%
    50%
    20%
    30%
  • What can be done to save coral reefs?
    All of the other options.
    Reduce pollution.
    Create marine protected areas.
    Ban or limit fishing fishing.
  • What are some threats to coral reefs?
    Overfishing, pollution, climate change, and damage from divers.
  • How do humans benefit from coral reefs?
    They provide food, jobs, protect coastlines, and are a source for new medicines.
  • What is coral bleaching?
    It's when a coral turns white.
  • What does the word "remains" in the text refer to?
    It refers to the dead skeletons of old polyps where young polyps make new skeletons on.
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