Across
- 4. a motor vehicle with four wheels; usually propelled by an internal combustion engine
- 6. Polyester is thermoplastic, meaning it can be melted and reformed. When making polyester, chemists melt polyester pellets and force them through small holes (spinnerets). The material is used extensively in clothing.
- 9. an account of a person's life written by that person
- 11. a tracing made by a polygraph (an instrument for recording variations of pulse, blood pressure, and breathing etc or a ‘lie detector’)
- 13. A plane shape (two-dimensional) with straight sides.
- 15. a group of events that happen in a particular order, one following the other, and often repeated
- 16. triangles, rectangles and pentagons.
- 18. If a machine or device does something automatically, it does it independently, without human control.
Down
- 1. complete control of the supply of particular goods or services, or a company or group that has such control; controlled by one person or group and not shared by others
- 2. a book, set of books, optical disc, mobile device, or online informational resource containing articles on various topics
- 3. A solid with flat faces. Each flat face is a polygon. Examples include prisms, pyramids, cubes and many more. Polyhedron comes from Greek, poly- meaning "many" and -hedron meaning "face".
- 4. a signature, especially of a famous person
- 5. A cyclone is a violent tropical storm in which the air goes round and round.
- 7. one of the most widely used plastics, a light, usually white plastic used especially for putting around delicate objects inside containers to protect them from damage, or for putting around something to prevent it from losing heat
- 8. the ability to make your own decisions without being controlled by anyone else
- 10. a two-wheeled vehicle that you sit on and move by turning the two pedals
- 12. to treat or process (used or waste materials) so as to make suitable for reuse
- 14. (of a device or process) working by itself with little or no direct human control
- 17. a device that keeps aircraft, spacecraft, and ships moving in a particular direction without human involvement
- 19. carried out by machines or computers without needing human control
- 20. autobiographic - relating to or in the style of an autobiography; "they compiled an autobiographical history of the movement"