When Chemists Say That a Planet's Upper Regions Are Reduced

question 29

Multiple Choice

When chemists say that a planet's upper regions are reduced, they mean that these regions

• A) have far less material than other parts of the planet
• B) are dominated by the element oxygen and its compounds
• C) are so warm that no molecules can exist
• D) are dominated by the element hydrogen and its compounds
• E) have been bombarded over the years by many asteroids, causing large craters on the surface

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