Philosopher's Wool is

If we look at the sky from the moon, what will it look like?

Which of the following one of the following is not a 'green house gas' -

Gobar gas mainly contains

Isobars are lines joining places having equal

Earth's atmosphere is an envelope of gases extending to a height of

During a thunderstorm, the thunder in the sky is produced by the 
1. Meeting of cumulonimbus clouds in the sky. 
2. Lightning that separates the nimbus clouds.
3. Violent upward movement of air and water particles. 
Select the right answer using the codesgiven below.

Oils and fats are obtained from

Radiations which is not emitted during radioactivity is:

A bomb explodes on the moon. You will hear its sound on earth after ______