Across
- 5. (TWO WORDS-NO SPACES)Fuels such as coal, oil, or natural gas, that is formed from the remains of plants or animals that lived hundreds of millions of years ago.
- 7. Era of time that is composed of the Quaternary and Tertiary Periods.
- 8. Moisture falling from the sky in the form of either rain, sleet, or snow.
- 10. The air surrounding the planet.
- 11. A massive system of gases and many stars held together by gravity.
- 12. Water that is found underground.
- 13. The center of something such as the sun or the Earth.
- 15. To spin on an axis.
- 17. A material that people need from Earth.
- 18. Epoch in which many modern species of small mammals appeared. Characterized by a warm climate and the separation of large continents.
- 19. Everything that exists, including all planets, stars, solar systems, and galaxies.
- 24. The dense hot layer of rock beneath the Earth's crust.
- 25. A fracture in the Earth's crust along which rocks slide past each other.
Down
- 1. (TWO WORDS-NO SPACES)Unnatural warming of the planet due to humans burning fossil fuels. Also known as global climate change.
- 2. A pattern of stars in the night sky.
- 3. (TWO WORDS-NO SPACES) The star closest to Earth.
- 4. (TWO WORDS-NO SPACING) A process t hat determines the absolute age of rocks by measuring the decay of radioactive materials within them.
- 6. The leading edge of a moving air mass.
- 9. (TWO WORDS-NO SPACES) The circulation of water on Earth through evaporation from the surface into the atmosphere and back to the surface of the Earth by precipitation.
- 14. To wear away.
- 16. Earth's outermost and thinnest layer.
- 20. The spin around another object.
- 21. An organized list that gives information in a form that is easy to read.
- 22. What "geos" means in English.
- 23. A large piece of the Earth's lithosphere.