| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| The glass used in most windows is made from a mixture of lime, soda & this | sand | $200 | J | SCIENCE & NATURE | 1991-05-20 | #1561 | |
| Surprisingly, this only covers about 10 to 20% of most deserts | sand | $300 | J | NATURE | 1985-05-30 | #189 |