Across
- 6. movement of water (and nutrients) across Earth’s surface
- 7. bacteria convert ammonia to nitrites (NO₂⁻) and nitrates (NO₃⁻)
- 8. increase in Earth’s temperature from trapped heat by CO₂ and other gases
- 11. flow of water into the ground to recharge aquifers
- 13. movement of elements through living organisms and the environment
- 14. downward movement of water into soil and rock layers
- 15. the shape of Earth’s orbit around the Sun, ranging from more circular to more elliptical on ~100,000-year cycles.
Down
- 1. phosphate settles in oceans forming new rocks
- 2. decomposition releasing ammonia from organic matter
- 3. storage location for elements or compounds (e.g., ocean, atmosphere, soil)
- 4. all water on, above, and below Earth’s surface
- 5. water vapor cools to liquid forming clouds
- 9. rain, snow, sleet, or hail returning water to Earth
- 10. any process, location, or system that absorbs or stores a substance or energy
- 12. layer of rock or sediment holding groundwater