character: Hank Green
topic: Solutions to Acid Rain
grade: 11
subject: Chemistry
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character: Hank Green
topic: Environmental Chemistry
grade: 11
subject: Chemistry
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character: Hank Green
topic: pH and its Importance
grade: 11
subject: Chemistry
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character: Hank Green
topic: Effects of Pollution on Ecosystems
grade: 11
subject: Chemistry
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