History of the Atmosphere

What was the composition of Earth's primordial atmosphere?

• Hydrogen and helium

• Oxygen and nitrogen

• Carbon dioxide and methane

• Sulfur dioxide and ammonia

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During which period did volcanic activity release gases like water vapor and carbon dioxide into the atmosphere?

• 4.5 Billion Years Ago

• 4.4 to 4.0 Billion Years Ago

• 2.5 Billion Years Ago

• 600 Million Years Ago

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The Great Oxidation Event led to a significant increase in atmospheric ___.

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What is the primary function of the ozone layer?

• To provide oxygen for breathing

• To protect Earth from harmful UV radiation

• To trap heat and warm the planet

• To support photosynthesis

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The Earth's current atmosphere is composed of approximately 78% nitrogen and ___% oxygen.

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Which event marked the formation of the ozone layer?

• The Great Oxidation Event

• Formation of the primordial atmosphere

• Outgassing and formation of a secondary atmosphere

• Accumulation of oxygen in the upper atmosphere

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Human activities such as industrialization have contributed to ___ change.

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