Across
- 1. a small, rocky object that orbits the sun; mainly located in a band between the orbits of Mars and Jupiter
- 3. the scientific study of Earth's atmosphere, especially in relation to weather and climate
- 5. the movement of matter due to differences in density that are caused by temperature variations
- 7. a celestial body that orbits the sun, is round because of its own gravity, and has cleared the neighborhood around its orbital path
- 9. a community of organisms and their abiotic environment
- 13. an idea or explanation that is based on observations and that can be tested
- 16. the solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle
- 18. the process of recovering valuable or useful materials from waste or scrap; the process of reusing some items
- 19. the theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions
- 20. a break in a body of rock along which one block slides relative to another
- 21. a loose mixture of rock fragments and organic material that can support the growth of vegetation
Down
- 2. the scientific study of Earth and the universe around it
- 4. the average weather conditions in an area over a long period of time
- 6. a collection of stars, dust, and gas bound together by gravity
- 8. a condition in which a substance is cooled below its freezing point, condensation point, or sublimation point without going through a change of state
- 10. a nonrenewable energy resource formed from the remains of organisms that lived long ago
- 11. the scientific study of the origin, history, and structure of Earth and the processes that shape Earth
- 12. the part of earth where life exists
- 14. weathering the process by which rocks break down as a result of chemical reactions
- 15. the change of state from a gas to a liquid
- 17. a subatomic particle that has no charge and that is located in the nucleus of an atom