- The acid rain destroys vegetation because it contains
- “Crust” is earth’s:
- The rarest gas in air is ?
- The rarest gas in air is:
- Which one of the following greenhouse gases has the greatest warming effect?
- The solidified form of which gas is known as Dry Ice?
- Which gas is used in the preparation of soft drinks?
- The “Sun” Is mainly composed of:
- Which has is usef in electric bulb?
- Plants during night exhale: