Question

What are the main components of the atmosphere? How does their composition support life on earth?

Answer 1

1. Nitrogen (78%): Maintains air pressure and supports plant growth through the nitrogen cycle.
2. Oxygen (21%): Essential for respiration in humans and animals.
3. Argon (0.93%): An inert gas with minimal role in life processes.
4. Carbon dioxide (0.04%): Used by plants in photosynthesis and helps regulate Earth’s temperature.
5. Water vapour: Supports the water cycle and causes weather phenomena.
6. Dust particles: Found in the stratosphere, it protects life by blocking harmful ultraviolet (UV) radiation.