Gases in the air
Contains two slides which show how the composition of the atmosphere has changed over time. Then a task where students arrange statements to show how the atmopshere evolved. Finishes with a slide of questions for students to answer.

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  • gases in the air.ppt

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Created: Jul 20, 2010

Updated: Aug 19, 2015

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ppt, 60 KB

gases in the air

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