Oceans on the Edge Quiz 2

Which ocean layer is described as "very light, sometimes wet, sometimes dry"?

• Shallow Seas

• Shore

• Open Ocean

• Deep Ocean

What temperature range do coral reefs develop in?

• 15-20 degrees

• 20-22 degrees

• 25-27 degrees

• 30-35 degrees

What is the main reason coral reefs are important?

• They provide fresh water

• They are a major tourist attraction

• They produce oil

• They create sand

What happens to corals when they die?

• They turn green

• They become invisible

• They lose their color and the white skeleton is visible

• They float to the surface

What percentage of the world's oxygen is provided by the ocean?

• 10%

• 25%

• 50%

• 75%

Which ocean layer is described as "very dark and very cold"?

• Shore

• Shallow Seas

• Open Ocean

• Sea Floor

What is the role of Zooxanthellae in coral reefs?

• They provide food for fish

• They give corals their color

• They clean the water

• They produce sand

What is a major threat to the ocean mentioned in the document?

• Overfishing

• Deforestation

• Air pollution

• Desertification

What percentage of all known marine species live in coral reefs?

• 10%

• 25%

• 50%

• 75%

What is the main component of coral skeletons?

• Calcium carbonate

• Silica

• Iron

• Magnesium