Why Did Earth's Earliest Atmosphere, Composed Primarily of Hydrogen and Helium

question 20

Multiple Choice

Why did Earth's earliest atmosphere, composed primarily of hydrogen and helium, NOT last long?

• A) Hydrogen is highly reactive, and it soon became bound into chemical compounds in Earth's rocks.
• B) Hydrogen and helium are light gases, and they soon escaped into space.
• C) Biological activity very quickly combined the hydrogen with oxygen to form water.
• D) The hydrogen soon became dissolved in Earth's oceans.

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