Across
- 2. a small drop of a liquid
- 4. an empty space or opening in an object
- 5. to send back light, heat, energy, or sound from a surface
- 6. the process by which a substance or object takes in a liquid, gas, waves, or chemical and makes it a part of itself
- 7. to move slowly, a line or border at which a surface ends
- 9. the central point, position, or part
- 14. the smallest pieces of matter that make up atoms or the parts of atoms
- 16. to break, or to break something, into smaller parts
- 21. the distance that can be travelled
- 22. the quality of being white
- 24. an arch (= curved shape) of different colours seen in the sky when rain is falling and the sun is shining
- 26. causing, caused by, or connected with light or sound changing direction or separating
- 29. a line of light (particles) flowing in one direction
- 30. the quality of being bright from reflected light on the surface
- 31. in the direction of
- 32. the light that comes from the sun
- 33. move away over a large area, or to cause this to happen
- 35. a hard, transparent material, used to make windows, bottles, and other objects
- 37. from one side or end to the other, from one part to another
- 39. a unit used for measuring length, approximately equal to 2.54 centimetres
- 40. a long, thin line of something such as light or smoke
- 42. to (cause to) move far apart in different directions
- 44. relating to, or characterized by a colour or colours
- 45. the separation of light into different colours
- 47. for that reason
- 48. a range of waves such as light waves or radio waves
- 50. to send something through the air with force
Down
- 1. in every part, or during the whole period of
- 3. the simplest unit of a chemical substance, usually a group of two or more atoms
- 6. the space between two lines or surfaces at the point at which they touch each other
- 8. having the shape of a sphere rounded
- 10. any picture, especially one formed by a mirror or a lens
- 11. the curved path that an object follows after it has been thrown or shot into the air
- 12. a solid shape with a round base that narrows to a point at the top
- 13. The particular physical form or appearance of something
- 15. the brightness that comes from the sun, fire, etc. and from electrical devices
- 17. to watch carefully the way something happens
- 18. having a particular shape
- 19. the image of something in a mirror or on any reflective surface
- 20. to make light waves move in one direction only, or mainly in one direction
- 23. a small, round spot, mark
- 25. a piece of glass or plastic having a curved surface in order to change the images to make them larger, or smaller
- 27. a thin piece of wood or other material
- 28. transparent glass or plastic object that separates white light that passes through it into different colours
- 30. the movement of something turning round quickly
- 32. considered on its own and separate from other things
- 34. the fact of light or sound being caused to change direction
- 36. the quality of having parts on either side or half that match each other
- 38. a small electric light you can carry in your hand
- 41. to see something or someone, or to notice something
- 43. the symbol for a number or an amount expressed in numbers
- 46. a structure, consisting of a curved top on two supports
- 48. continuing in one direction without bending or curving
- 49. to change direction or to separate when something travels through a substance