Both directions use the same worksheet. The shaded box in each answer is the letter to copy into the matching vault slot.
Name: ______________________ Date: ____________
Solve a clue and copy the shaded letter from your answer into the matching vault slot. Solve the clues in any order. Spaces don't count as letters. Solve every clue, then open the vault.
| Vault slot | Clue | Answer | Take letter |
|---|---|---|---|
| 1 | The remains of a plant or animal that existed in a past geological age and that has been excavated |
|
3rd |
| 2 | Of or relating to or used in the production of electricity by waterpower |
|
9th |
| 3 | The total mass of living matter in a given unit area |
|
2nd |
| 4 | Rotary engine in which the kinetic energy of a moving fluid is converted into mechanical energy |
|
7th |
| 5 | Moving air |
|
3rd |
| 6 | Any of several kinds of apparatus that maintain and control a nuclear ___ for the production |
|
4th |
| 7 | Rolling swells on the sea |
|
4th |