| Hints | Answer |
| What gas makes up 76% of the air? | |
| What gas makes up 21% of the air? | |
| This gas makes up .6% of the air | |
| The type of sphere that is made up of air. | |
| The type of sphere that is made up of water. | |
| The type of sphere that is made up of rock, soil, etc. | |
| The type of spere that is made up of living things. | |
| Volcanic rock releases this into the atmosphere. | |
| These are burned by humans and pollute the air. | |
| These attacked the Lake trout in the great lakes. | |