Which term refers to a mixture of gases that makes up Earth's atmosphere?

Which term refers to a mixture of gases that makes up Earth's atmosphere?

• A. Aero
• B. Air
• C. Altitude
• D. Aerospace

Answer: (B)

Air is the mixture of gases that surrounds Earth. It isn’t a single gas but a blend, composed mostly of nitrogen and oxygen, with smaller amounts of argon, carbon dioxide, neon, helium, methane, and other trace gases. This gaseous mix is what we breathe, and it also acts as the medium for weather, sound transmission, and life-support processes. The prefix aero- appears in many aviation and flight terms, but it doesn’t name the atmospheric mixture. Altitude refers to height above a reference level, and aerospace denotes the field combining aviation and spaceflight. So the term that specifically names the atmospheric gas blend is air.

Air is the mixture of gases that surrounds Earth. It isn’t a single gas but a blend, composed mostly of nitrogen and oxygen, with smaller amounts of argon, carbon dioxide, neon, helium, methane, and other trace gases. This gaseous mix is what we breathe, and it also acts as the medium for weather, sound transmission, and life-support processes. The prefix aero- appears in many aviation and flight terms, but it doesn’t name the atmospheric mixture. Altitude refers to height above a reference level, and aerospace denotes the field combining aviation and spaceflight. So the term that specifically names the atmospheric gas blend is air.