Across
- 6. Something that has been built and arranged in a certain way.
- 8. The action of one object striking another.
- 10. The movement of energy from one object or system to another.
- 11. An object that is not moving.
- 14. A detailed plan or drawing for building.
- 15. An action to try and damage or take over something.
- 16. A push or pull that makes something move.
- 18. A bridge that can be raised or lowered to block or allow entry.
- 20. The action of protecting from attack.
Down
- 1. A machine that hurls objects through the air.
- 2. A large fortified building used for protection.
- 3. A strong building or structure built to protect people inside.
- 4. When two or more objects strike each other.
- 5. A complicated device that uses a chain reaction to complete a simple task.
- 7. A heavy beam used to break through walls or gates.
- 9. When two objects physically touch.
- 12. A deep ditch, usually filled with water, surrounding a castle.
- 13. A small tower on top of a larger tower or wall.
- 17. A model built to test an idea.
- 19. The ability to do work or cause change.