Which statement about the atmosphere's role in shielding Earth from space debris is most accurate?

• A. It has no role.
• B. It burns up meteors and reduces some debris reaching surface.
• C. It stops all meteor from reaching surface.
• D. It causes all meteor to burn completely.

Answer: (D)

The atmosphere acts as a shield by transforming the energy of incoming objects into heat as they plow through air. When a meteoroid enters at high speed, air is rapidly compressed and heated, causing it to burn up or ablate. This means most small meteoroids vaporize or burn before they reach the ground, while some larger pieces can survive and land as meteorites. So the atmosphere burns up meteors and reduces the amount of debris that reaches the surface. Statements claiming it stops all meteors or that all burn completely aren’t accurate, and saying it has no role ignores this protective effect.