Page 23 - 新思维科学学生用书9 样章
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1 Photosynthesis and the carbon cycle
1.3 The carbon cycle
In this topic you will:
• find out how carbon atoms move between the air, living organisms and fossil
fuels
• bring together what you know about respiration and photosynthesis, to think
about how they affect the amount of carbon dioxide in the atmosphere.
Getting started
Work with a partner.
Imagine one of you is a carbon atom. You are part of some carbon
dioxide in the air.
Do you exist as an element, or are you part of a compound?
What happens to you when a plant uses you in photosynthesis? Do
you change into something else, or are you still a carbon atom?
Key words
carbon cycle
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