Across
- 4. a solid object that occupies space and carries electric charge.
- 5. a device for combining a flammable gas with controlled amounts of air before ignition
- 6. particles that are tight or closely packed
- 7. a substance (such as an element or compound) that is made by a chemical process.
- 8. any of the four substances air, water, fire, and earth
Down
- 1. a substance that is formed when chemicals bond together
- 2. particles that have neither a defined volume nor defined shape.
- 3. a minute portion of matter
- 6. the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
- 9. a substance that flows freely but is of constant volume