| Answer | Crossword Clue |
|---|---|
| AIR | It consists of nitrogen, oxygen, etc. |
| titanium | dark-gray or silvery, lustrous, very hard, light, corrosion-resistant, metallic element, occurring combined in various minerals: used in metallurgy to remove oxygen and nitrogen from steel and to toughen it. Symbol: Ti; at. wt.: 47.90; at |
