The thin layer of gases surrounding the Earth is called the ...

• A. Atmosphere
• B. Precipitation
• C. Drainage basin
• D. Hydrological cycle

Answer: (A)

The thin layer of gases surrounding the Earth is called the atmosphere. It’s the gaseous envelope held by gravity that surrounds the planet, extending from the surface upward through layers such as the troposphere and stratosphere and gradually blending into space. The atmosphere is composed mainly of nitrogen and oxygen, with smaller amounts of water vapor, carbon dioxide, and other gases. It supports life by providing breathable air, shields the surface from harmful solar radiation, and helps regulate Earth’s temperature through processes like the greenhouse effect. This concept is distinct from precipitation (water that falls as rain, snow, etc.), a drainage basin (the land area that drains to a common outlet), and the hydrological cycle (the continuous movement of water within Earth’s systems).