Across
- 3. a biological community of interacting organisms
- 5. a waste product that your body makes when it uses food for energy
- 6. an educated guess
- 9. a disturbance that moves the medium perpendicular to its line of travel
- 13. oxygen is used to make energy from carbohydrates (sugars)
- 15. something that is being measured
- 16. something you change in an experiment
- 18. when prehistoric plants and animals died and were gradually buried by layers of rock.
- 20. energy that is stored in an object
- 23. energy that comes from a source that won't run out
- 24. a group of atoms bonded together
- 25. light energy is converted to chemical energy in the form of sugars
- 26. flows and takes the shape of its container
Down
- 1. when chemical bonds between atoms are formed or broken
- 2. type of sugar you get from foods you eat, and your body uses it for energy
- 4. something that stays the same
- 7. how fast or slow an object moves
- 8. when an object is moving
- 10. particles are barely moving and are close together
- 11. particles are moving super fast and are spread out
- 12. the sequence of transfers of matter and energy in the form of food from organism to organism
- 14. light bends when it passes from one medium to another
- 17. the variety of life in the world or in a particular habitat or ecosystem
- 19. we need this to breathe
- 21. the ability to do work
- 22. a reaction in which energy is released