Oxygen is the most common element in minerals in Earth's crust, which is why the release of gases from the crust over time has produced an atmosphere rich in oxygen today.

Name: Oxygen is the most common element in minerals in Earth's crust, which is why the release of gases from the crust over time has produced an atmosphere rich in oxygen today.
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Quizplus · Accepted Answer

The atmosphere's oxygen primarily comes from photosynthesis by plants and microorganisms, not directly from the release of gases from Earth's crust.

Oxygen Is the Most Common Element in Minerals in Earth's