Vocabulary

3. A scientist who studies volcanoes and volcanic phenomena.
4. An instrument for copying a plane figure to a desired scale, consisting of styluses for tracing and copying mounted on four jointed rods in the form of a parallelogram with extended sides.
5. Run by or using compressed air
7. Providing information or stimulation for a number of senses, not only sight and sound
8. A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
10. An air deflector mounted usually at the rear of an automobile to reduce lift at high speeds
11. Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight.
12. Completely confused or disordered
13. A lustrous, hard, steel-gray metallic element, resistant to tarnish and corrosion and found primarily in chromite
14. a swinging lever, weighted at the lower end, for regulating the speed of a clock mechanism
16. A thin plastic or metal woven mesh

1. A salt or ester of phosphoric acid
2. A slight puncture made by or as if by a pin.
6. A hard, white, translucent ceramic made by firing a pure clay and then glazing it with variously colored fusible materials; china.
9. A flaky deposit left in containers such as kettles by the action of heat on water containing calcium salts
15. A separate streamlined enclosure on an aircraft for sheltering the crew or cargo or housing an engine.