Carbon Cycle and Its Impact on Earth's Atmosphere

What percentage of dead marine snow material reaches the ocean floor and is buried?

• 0.1%

• 1%

• 5%

• 10%

What is the estimated amount of carbon leakage to the crust per year?

• 5 Giga tons

• 0.05 Giga tons

• 0.005 Giga tons

• 0.5 Giga tons

How does carbon leakage to the crust affect atmospheric oxygen levels?

• It decreases oxygen levels.

• It increases oxygen levels.

• It has no effect on oxygen levels.

• It causes oxygen levels to fluctuate wildly.

During the Carboniferous period, what was a significant result of increased carbon burial?

• Decrease in plant growth

• Increase in atmospheric oxygen

• Increase in atmospheric CO2

• Decrease in atmospheric oxygen

Why is the Carboniferous period named so?

• Due to the formation of large coal deposits

• Because of high oxygen levels

• Because of the formation of large deserts

• Due to the extinction of many species

What was a consequence of the Carboniferous oxygen spike?

• Decrease in insect size

• Increase in volcanic activity

• Decrease in plant growth

• Increase in insect size

What is kerogen?

• A form of organic carbon in sedimentary rocks

• A process of carbon weathering

• A type of fossil fuel

• A type of sedimentary rock

What happens to kerogen when sedimentary rocks are weathered?

• It remains unchanged.

• It is converted back to CO2.

• It becomes part of the soil.

• It turns into fossil fuels.

How does the natural weathering of sedimentary rocks contribute to the carbon cycle?

• It adds CO2 to the atmosphere.

• It only affects marine carbon levels.

• It removes CO2 from the atmosphere.

• It has no impact on the carbon cycle.

How does fossil fuel extraction compare to natural weathering in terms of carbon release?

• It does not release carbon.

• It releases carbon at a slower rate.

• It releases carbon at a similar rate.

• It releases carbon at a much faster rate.