Across
- 2. force that attarcts objects towards the earth's centre
- 6. materials that completely block the light
- 7. the ability to do work
- 9. dark spot formed by opaque object
- 10. an igneous rock used for polishing teeth
Down
- 1. a push or pull acting on an object
- 3. a Japanese word meaning 'harbour wave'
- 4. the point under the ground where the earthquake begins
- 5. molten rock inside the earth
- 8. object non which work is to be performed