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Time Zones 4 - Unit 6 - Reading
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How much of the world's coral reefs is already dead?
 
20%
 
30%
 
10%
 
50%
How big is the great barrier reef?
 
350.000 square kilometer
 
450.000 square kilometer
 
150.000 square kilometer
 
250.000 square kilometer
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.
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?
 
both
 
They are good for the coral reefs.
 
They harm the coral reefs.
What are the chemicals from reef creatures used for?
They are used to make medicine.
What are some threats to coral reefs?
Overfishing, pollution, climate change, and damage from divers.
How do coral reefs protect the coast?
They slow down waves and prevent erosion on the beaches.
Why do polyps use calcium?
They use it to build a hard limestone skeleton.
What can be done to save coral reefs?
 
All of the other options.
 
Ban or limit fishing fishing.
 
Reduce pollution.
 
Create marine protected areas.
What is coral bleaching?
It's when a coral turns white.
What is the cause of coral bleaching?
Global warming (warmer ocean temperatures)
How do humans benefit from coral reefs?
They provide food, jobs, protect coastlines, and are a source for new medicines.
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.
What are coral polyps?
Coral polyps are small creatures that build coral reefs.
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