Across
- 5. What is happening when a puddle disappears.
- 7. The force that pulls objects together.
- 8. The study of earth's structure.
- 10. The planet closest to the sun.
- 11. A solid becoming a liquid.
- 13. What is happening when water droplets form on a mirror.
- 17. The unit of measurement for force.
- 19. The process by which plants make their food.
Down
- 1. A device used to study small things.
- 2. The part of an atom which carries a positive charge.
- 3. The process of water turning to ice.
- 4. The smallest unit of matter.
- 6. The measure of how acidic or basic something is.
- 9. The process of a solid turning into a gas without passing through the liquid state.
- 12. A substance that cannot be broken down into simpler substances.
- 14. _______ three laws of motion.
- 15. The study of heredity.
- 16. The most basic units of life.
- 18. The measure of total matter.