Across
- 1. Weight is an example of this
- 3. The unit that weight is measured in
- 4. The main gas needed to support life
- 7. What all masses do to each other
- 8. The gravitational pull on an object
- 10. Reaches from the Earth's surface to 100 km above the Earth
- 11. The unit that mass is measured in
- 12. The state of water needed to support life
- 13. The region between astronomical objects such as planets, moons and stars and is almost a perfect vacuum
Down
- 2. An organism that can live in extreme conditions such as high temperature or low oxygen levels
- 5. Also needed to support life
- 6. The amount of matter in a substance
- 9. A suitable one of these is needed to support life