P1B 7 The Oceans as a Store of Carbon & Ocean Acidification

What percentage of carbon dioxide released by humans is absorbed by the oceans?

• 10%

• 25%

• 50%

• 75%

What happens to the ability of the oceans to absorb CO₂ as ocean temperatures rise?

• It increases

• It decreases

• It remains the same

• It fluctuates

What is the process by which carbon dioxide in the atmosphere is absorbed by ocean water?

• Photosynthesis

• Respiration

• Decomposition

• Absorption

Which organisms use carbon dioxide to produce hard shells made from calcium carbonate?

• Phytoplankton

• Corals

• Seagrasses

• Mussels

What is the largest reservoir of carbon on the planet?

• Atmosphere

• Soils

• Deep ocean

• Sediments

What has caused the pH of surface ocean waters to fall since the Industrial Revolution?

• Deforestation

• Ocean acidification

• Volcanic activity

• Global warming

Which species are most affected by ocean acidification?

• Phytoplankton

• Seagrasses

• Corals

• Mussels

What is the main cause of coral bleaching?

• Ocean acidification

• Rising temperatures

• Pollution

• All of the above

What is the economic importance of coral reefs?

• Protecting coastlines from erosion

• Providing revenue for fishing fleets

• Serving as tourist destinations

• All of the above

Who relies on food from the ocean as their primary source of protein?

• Children

• Farmers

• Scientists

• Over a billion people worldwide