Couldn't confirm presence of Flash 7 or higher because JavaScript was disabled.
We highly recommend that you install Flash 7 or higher and that you enable JavaScript.
Get Flash ---
I really do have Flash installed.
What follows is a plain HTML version of the puzzle.
Book 27
Lesson 3
Across
3. a substance used for causing explosions, especially for breaking rock into pieces
6. to start doing something different from what is expected or agreed
7. a period of time between two events
8. a drawing that explains something
12. made up of separate parts
14. to put people or things into particular groups according to the features that they have
15. a piece or part of something
16. a substance or an object that can cause an explosion
17. to be gradually destroyed by a chemical reaction
Down
1. an object like string that burns slowly to make a bomb, firework etc explode
2. the force with which one objects hits another
3. to explode, or to make something such as a bomb explode
4. a set of tools or equipment for a particular purpose or activity
5. to keep someone or something
9. very great, or complete: used for emphasizing an opinion, feeling, or statement
10. something that consists of two or more substances mixed together
11. to break something suddenly into a lot of small pieces
13. a situation in which people or things touch each other