Across
- 1. What is the hardest natural substance on earth?
- 6. The process by which plant make their own food
- 7. The basic unit of life
- 8. The force that pull object towards the centre of the
Down
- 2. Smallest unit of matter
- 3. Unit of pressure
- 4. The metal that is liquid at room temperature
- 5. The powerhouse of the cell