Across
- 2. ___ make things move
- 4. We always see the ___, then we hear the thunder.
- 7. we can use ___ to find out the speed of sound.
- 9. scientists can measure the ___ between the earth and the moon using their knowledge about how light travels.
Down
- 1. Light travels a ___ times faster than sound.
- 3. the earth spins around once a day, in a ___ direction.
- 5. All objects are attracted to each other; we call this invisible force ___.
- 6. The first scientist who realized that white light from the sun was a mixture of colours of the rainbow.
- 8. the science of matter, energy, space and time