Carbon Cycle Summary

These flashcards cover essential concepts related to the carbon cycle, including the effects of human activity, plant behavior, and historical CO2 levels.

What do plants do with CO2 during summer and spring?

Plants take in more CO2 when they are growing and photosynthesizing.

How does plant activity change in the fall and winter?

Plants take in less CO2 when they lose their leaves or die back.

What historical event significantly increased atmospheric CO2 levels?

The Industrial Revolution in the 1800s led to an increase in fossil fuel burning.

What are the current atmospheric CO2 levels compared to 800,000 years ago?

We haven't had CO2 levels this high in over 800,000 years.

What happens to carbon sinks due to burning fossil fuels and deforestation?

These actions turn carbon sinks into carbon sources.

How does burning fossil fuels affect the carbon cycle?

It moves carbon stored underground into the atmosphere faster than natural processes can remove it.

What is the time frame for plant growth and decay in the carbon cycle?

Very fast (less than 1 year).

How long does the slow carbon cycle generally take?

Over 100 years.

What role do plants play in the carbon cycle?

Plants absorb carbon, which is then passed through the food chain and released back into the atmosphere through respiration and decay.

How does carbon enter the hydrosphere?

Carbon is used in the ocean food web and is released into the atmosphere.