Across
- 9. a unit of length equal to one thousand meters
- 11. globular stone, the cavity of which is lined with crystals
- 13. the boundary or border of a figure or area
- 15. an instrument that measures the pressure of the atmosphere and is used to predict the weather
- 18. the scientific study of the relationships between living things and their environments
- 19. an instrument that uses a lens to make very small objects larger
- 21. having to do with the heat produced inside the earth
- 22. an account of the roots and history of a word and its meanings
- 23. an instrument on a submarine that enables sight above water
Down
- 1. an instrument that makes the sounds inside a body louder
- 2. the science and study of animals
- 3. a diagram of the relative positions of the stars, planets, and signs of the zodiac
- 4. an instrument that uses lenses and sometimes mirrors to make distant objects appear larger
- 5. a unit of length (10 in a cm)
- 6. the study of the physical structure of the earth and how it has changed over time
- 7. using, resulting from, or producing heat
- 8. the study in mathematics of objects and shapes
- 10. a straight line from one side of a circle to the other side that passes through the centre
- 12. an instrument for measuring temperature
- 14. a collection of myths
- 16. the study of the earth's surface, climate, land forms, and bodies of water
- 17. a container that is used to keep food or drink at its original temperature
- 20. a device that automatically controls the temperature within a particular space after someone has set a temperature
- 24. a instrument that measures the speed of a moving vehicle