Origin of Oxygen

Earth's atmosphere III was primarily composed of ______.

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Remembering

What process contributed to the initial introduction of oxygen into Earth's atmosphere?

• Volcanic activity

• Photodissociation

• Condensation

• Carbonate formation

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Understanding

The stratospheric ozone layer protects living things from ______ radiation.

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Remembering

Which stage of Earth's atmosphere was characterized by a weak association of hydrogen and helium?

• Atmosphere I

• Atmosphere II

• Atmosphere III

• Modern atmosphere

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The increase in oxygen concentration in Earth's atmosphere about 2.5 billion years ago is correlated with the activities of ______.

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Understanding

What was the main component of Earth's atmosphere II?

• Water vapor

• Carbon dioxide

• Nitrogen

• Oxygen

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The formation of carbonate rocks was primarily due to the removal of ______ from the atmosphere.

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Understanding