Across
- 3. The branch of mathematics dealing with the properties and relations of points, lines, surfaces, and solids
- 4. The three-dimensional space in which objects exist
- 6. The mathematical constant approximately equal to 3.14
- 7. The force that opposes motion between two surfaces
- 9. A figure with six sides
- 12. A measure of the amount of matter in an object
- 13. The basic unit of life
- 14. The distance around a circle
- 16. The chemical element with the symbol 'O'
- 18. The study of matter and its changes
Down
- 1. The pH level of pure water
- 2. The process of determining the size, length, or amount of something
- 4. The smallest particle of an element
- 5. The temperature at which a substance changes from solid to liquid
- 6. The process by which plants convert sunlight into energy
- 8. The phenomenon where light bends as it passes through different mediums
- 10. A relationship in which one variable increases as the other decreases
- 11. A polygon with eight sides
- 15. The scientific study of weather
- 17. The force that attracts objects toward each other