| Answer | Crossword Clue |
|---|---|
| ACID | Anything below 7 on the pH scale |
| NONBASIC | 7 or below on the pH scale |
| ACID | It's below 7 on the pH scale |
| BASE | It's high on the pH scale |
| ACIDS | Lemon juice and coffee, on the pH scale |
| TALC | It's below gypsum on the Mohs scale |
| APATITE | Mineral below orthoclase on the Mohs scale |
