History and Composition of the Atmosphere

The Earth's initial atmosphere was composed mainly of hydrogen and ___.

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Remembering

What event marked a significant increase in atmospheric oxygen 2.5 billion years ago?

• The Great Oxidation Event

• The Cambrian Explosion

• The Permian Extinction

• The Ice Age

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Remembering

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

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Remembering

Which gas is present in the atmosphere at approximately 0.04% and is vital for photosynthesis?

• Carbon Dioxide

• Methane

• Oxygen

• Nitrogen

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Understanding

The ozone layer protects the Earth from harmful ___ radiation.

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Understanding

What is the primary role of nitrogen in the Earth's atmosphere?

• It plays a crucial role in the nitrogen cycle.

• It is essential for aerobic respiration.

• It contributes to the greenhouse effect.

• It forms the ozone layer.

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Understanding

Human activities such as industrialization have significantly impacted the atmosphere, contributing to ___ change.

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Understanding