1) What do plants take in during photosynthesis? a) Oxygen b) Carbon dioxide 2) What process releases carbon dioxide back into the atmosphere? a) Respiration b) Photosynthesis 3) What happens during decomposition? a) Plants grow b) Dead things release carbon 4) What are fossil fuels made from? a) Living animals b) Dead plants and animals 5) What does combustion release? a) Water b) Carbon dioxide 6) What are forests and oceans called? a) Carbon sinks b) Carbon sources 7) What are cars and factories examples of? a) Carbon sinks b) Carbon sources 8) What is the main component of natural gas? a) Methane b) Oxygen 9) What is the process of converting carbon dioxide into organic compounds? a) Photosynthesis b) Combustion 10) What is the effect of increased carbon dioxide in the atmosphere? a) Global warming b) Cooling

Carbon Cycle Quiz

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