Across
- 2. the capacity to do work.
- 3. an object so massive and dense that even light cannot escape its gravity.
- 8. the physical forms of matter.
- 9. a natural or artificial body that revolves around a planet.
- 11. the amount of water vapor in the air.
- 13. a narrow belt of strong winds that blow in the upper troposphere.
- 15. a relationship between two species in which both species benefit.
- 16. the basic unit of length in the Sl.
- 17. the change of state from a gas to a liquid.
- 19. a test model of a product.
- 21. the time required for Earth to rotate once on its axis.
- 22. a large, reddish star late in its life cycle.
Down
- 1. a force that opposes motion between two surface that are in contact.
- 4. an orbit that is less than 1,500km above the Earth surface.
- 5. a movement of ocean water that follows a regular pattern.
- 6. a large body of air where temperature and moisture content are similar throughout.
- 7. any form of water that falls to the Earth's surface from the clouds.
- 8. a tide of increased range that occurs two times a month, at the new and full moon.
- 10. an organism that eats only plants.
- 12. an organism that is killed and eaten by another organism.
- 14. a measure of the amount of matter in an object.
- 18. describes the nonliving part of the environment.
- 20. the transfer of energy as electromagnetic waves.