Chinese inventions

4. someone who is trained in science, especially someone whose job is to do scientific research
6. a square piece of wood
8. a machine, tool, or system that someone has made, designed, or thought of for the first time
10. a set of lines, shapes, or colours that are repeated regularly
12. the thin flat substance that you use for writing on or wrapping things in

1. a piece of equipment used for finding your way, with a needle that always points north
2. a substance that is used for causing explosions or for making fireworks
3. thin smooth cloth made from the fibres produced by an insect called a silkworm
5. the process of making books, newspapers etc, using a printing press to put words and pictures onto paper
7. to design or create something such as a machine or process that did not exist before
9. someone who works on a boat or ship
11. the brightly burning gas that you see coming from a fire