Which gas has the second-highest concentration in the atmosphere after nitrogen?

Correct option is A

The correct answer is option (a) Oxygen

Explanation

The Earth's atmosphere is composed primarily of nitrogen, which makes up about 78% of the atmosphere. The second-most abundant gas is oxygen, which constitutes about 21% of the atmosphere. This high concentration of oxygen supports life on Earth, especially for aerobic organisms, including humans.

The remaining 1% of the atmosphere is made up of various gases such as argon, carbon dioxide, neon, and others. While carbon dioxide plays an important role in the greenhouse effect and climate regulation, its concentration is much lower compared to oxygen and nitrogen.

Information Booster

• Nitrogen makes up 78% of Earth's atmosphere, the highest concentration.

• Oxygen is the second-most abundant gas, making up 21% of the atmosphere.

• Argon accounts for about 0.93% of the atmosphere.

• Carbon dioxide concentration is about 0.04% (400 ppm), though it plays a significant role in climate change.

Additional Knowledge

• Oxygen: Vital for life, it is used by most organisms for respiration and is also essential for combustion processes.

• Argon: Argon is a noble gas, and its low reactivity means it doesn’t easily form compounds.

• Carbon dioxide: Despite its low concentration, carbon dioxide is a critical greenhouse gas, responsible for trapping heat in the Earth's atmosphere and contributing to global warming.