Across
- 1. – substance that speeds up a chemical reaction
- 3. – medieval system of lords, vassals, and serfs
- 5. – product of all positive integers up to n
- 9. – a narrow inlet between steep cliffs formed by glaciers
- 11. – the powerhouse of the cell
- 12. – rate of change in calculus
Down
- 2. – solid changing directly to gas
- 4. – intellectual movement emphasizing reason and science
- 6. – a chain of islands
- 7. – a narrow strip of land between two seas
- 8. – religious wars between Christians and Muslims
- 10. – positively charged particle in an atom