Earth's Atmosphere

What percentage of Earth's atmosphere is composed of nitrogen?

• 21%

• 78%

• 1%

• 4%

What is a crucial role of nitrogen for life on Earth?

• It is essential for animals to breathe

• It helps plants create proteins

• It traps heat in the atmosphere

• It protects against ultraviolet radiation

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What is a primary function of oxygen in Earth's atmosphere?

• It is used in light bulbs

• It is essential for animals and plants to breathe

• It is the most variable gas

• It helps form clouds

What is the main protective function of ozone in the atmosphere?

• It helps regulate Earth's climate

• It is important for plant photosynthesis

• It protects Earth from harmful ultraviolet radiation

• It is the third most abundant gas