Exploring the Carbon Cycle

What percentage of the Earth's surface is covered by the ocean?

• 50%

• 71%

• 97%

• 85%

Which of the following is NOT a biogeochemical cycle mentioned in the video?

• Sulfur cycle

• Nitrogen cycle

• Water cycle

• Carbon cycle

What process do plants use to convert carbon dioxide into oxygen and glucose?

• Respiration

• Fermentation

• Photosynthesis

• Combustion

In the fast carbon cycle, what happens to the carbon in a rabbit after it eats a carrot?

• It becomes part of the rabbit's DNA.

• It is transferred back to the atmosphere or soil.

• It is converted into nitrogen.

• It is stored in the rabbit's tissues indefinitely.

What are fossil fuels primarily composed of?

• Sulfur and phosphorus

• Oxygen and nitrogen

• Carbon and hydrogen

• Calcium and potassium

What is the main role of phytoplankton in the ocean?

• They form coral reefs.

• They absorb nitrogen from the water.

• They produce oxygen through photosynthesis.

• They decompose dead marine animals.

What happens during a phytoplankton bloom?

• Phytoplankton die off rapidly.

• Phytoplankton multiply significantly.

• Phytoplankton migrate to deeper waters.

• Phytoplankton form coral reefs.

What is the effect of increased CO2 on ocean water?

• It increases the water's acidity.

• It makes the water more basic.

• It reduces the water's salinity.

• It decreases the water's temperature.

Why are carbonate ions important in the ocean?

• They increase the ocean's temperature.

• They help in the formation of coral reefs and shells.

• They are used by fish for respiration.

• They reduce the ocean's salinity.

What is the main concern with larger phytoplankton blooms?

• They consume all the oxygen needed by other marine animals.

• They cause coral reefs to die.

• They reduce the ocean's salinity.

• They increase the ocean's temperature.