Across
- 1. system where energy and matter enter and leave
- 3. things are similar no matter if scientists change their size
- 5. structures or events that are often repeated
- 9. an exact or measured amount
- 12. another word for power
- 14. something that has mass and takes up spaces
- 16. ideas found in science classes
- 17. a model of a system
Down
- 2. why something happened
- 3. the shape that scientists think we are
- 4. a phenomenon that repeats
- 6. a group of things working together
- 7. to look for patterns
- 8. used to examine objects that are too small to see with just our eyes
- 10. the size of every part of something matches all of its other parts
- 11. we have 78 of these necessary for survival
- 13. describes what happened
- 15. to measure quantities
- 18. a representation of an object or idea