Across
- 2. A process for obtaining pure water, involving boiling and then condensation.
- 6. The last name of the scientist whose famous gold foil experiment discovered the atomic nucleus.
- 7. The average weather conditions in an area over a long period (e.g., 30 years).
- 10. The scientific study of weather, weather forecasting, and atmospheric processes.
- 12. The distance you can see clearly through the air, reduced by fog, rain, or pollution.
- 13. The scientific study of climate, its patterns, and long-term changes.
- 15. The name for the different possible versions of an element, which have the same number of protons but different numbers of neutrons.
- 17. A substance containing two or more elements or compounds that are not chemically bonded together.
- 19. The dense, central core of an atom that contains protons and neutrons.
- 20. The layer of gases surrounding Earth, held in place by gravity.
- 21. The process where a liquid turns into a vapor, leaving behind any dissolved solids.
Down
- 1. The number of protons in an atom, which determines what element it is.
- 3. A unit of purity for gold, where 24 of these means pure gold.
- 4. The very thin sheet of metal that alpha particles were fired at, leading to the discovery of the nucleus.
- 5. The state of a substance that contains no other mixed-in materials.
- 8. A tiny particle with a negative charge that orbits the nucleus in shells or clouds.
- 9. A measure of how much water vapor is in the air.
- 11. The separation method that uses a filter paper to trap an insoluble solid from a liquid
- 14. A neutral particle (has no charge) found in the nucleus of an atom.
- 16. The short-term state of the atmosphere at a place and time (e.g., sunny, rainy).
- 18. Describes a mixture, like milk, that lets some light through but not all. You cannot see clearly through it.