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How Long Can You Hold Your Breath?
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In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to breathe.
Raising the Level of Carbon Dioxide in Your Blood
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In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream.
Make a Comet Model and Eat It!
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In this activity, learners build models of comets, using edible materials, to learn about comets' structure.
Breathing Blue
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In this activity, learners test exhaled breath for carbon dioxide and learn how to use an indicator as a simple way to measure pH.
Introduction to the Scientific Method
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In this activity (page 26 of the PDF), learners make observations, formulate hypotheses and design a controlled experiment, based on the reaction of carbon dioxide with calcium hydroxide.