| A | B |
|---|
| conservation | the protection of Earth's natural resources |
| remains | it stays in a landfill for many years |
| trouble | when someone creates a problem |
| extinct | when an there is no more of an animal; to disappear |
| hardest | the most difficult one |
| clerk | a person that works at a store or with paperwork |
| crook | someone who steals |
| brook | a small stream |
| soot | a black powder or flaky substance |
