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Chapter 8 - Air, Water, and Energy

earth_science

Unit C - Earth and Its Resources

Chapter 7 - Air, Water, and Energy

Discover more about the Earth's atmosphere, water, and resources.

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Science Bulletin

The Rise of Oxygen

Follow geologists as they hunt for, pickaxe, and test rock samples from the 2.5 billion year old Huronian Supergroup, a sedimentary formation in Ontario, Canada. The scientists are in search of an exact record of how much oxygen gas Earth's developing atmosphere contained at key moments in geologic time. These crustal relics, which have interacted directly with ancient atmospheres, have the power to tell scientists when and how the Earth built up its incredible life-support system to foster more and more complex organisms.

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