How Is the Existence of Earth's Unique Atmosphere Explained

question 70

Multiple Choice

How is the existence of Earth's unique atmosphere explained?

• A)The oxygen in Earth's atmosphere is a result of early life on Earth.
• B)Volcanic gases containing nitrogen were outgassed from Earth's interior.
• C)As Earth cooled, water vapor fell out of the atmosphere to form the oceans.
• D)Ultraviolet radiation from the Sun freed the hydrogen, allowing it to escape.
• E)When Earth formed, its atmosphere formed from the gases most common in the early solarsystem.

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