Question

The envelope of gases situated around the earth.

Answer 1

1. An envelope of gas that surrounds Earth is called the atmosphere.
2. It contains 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, 0.9% argon and traces of other gases.
3. Water vapour, dust particles and other solid particles are also found in the atmosphere.

Hence, the envelope of gases situated around the earth is called the atmosphere.