| Answer | Crossword Clue |
|---|---|
| OPER | It's below TUV on a phone |
| letterbox | technique for displaying a wide-screen film on a regular-format television screen by reducing its size until the entire image is visible, thus retaining the aspect ratio, with black bands filling the borders of the screen above and below the picture |
| TALC | It's below gypsum on the Mohs scale |
| NEON | It's below helium on the periodic table |
| ACID | It's below 7 on the pH scale |
