Sort me out

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Across
  1. 2. Plants grow in this brown, earthy substance.
  2. 6. A white or gray mass in the sky made of water droplets.
  3. 7. A tiny fiery particle that can ignite a flame.
  4. 8. A small, narrow river.
  5. 9. A large area covered with trees and undergrowth.
  6. 11. What fire does to things it touches.
  7. 12. A dry, sandy region with little rainfall.
  8. 14. A light, gentle wind.
  9. 16. A tall, natural elevation of the Earth’s surface.
  10. 18. What you see when you look up outdoors during the day.
Down
  1. 1. Air in motion.
  2. 3. A visible, dancing part of fire.
  3. 4. An overflow of water onto land.
  4. 5. The largest body of saltwater on Earth.
  5. 7. What rises into the air from burning material.
  6. 8. A violent disturbance in the atmosphere.
  7. 10. A glowing piece of coal or wood in a dying fire.
  8. 13. Water that falls from clouds.
  9. 15. A hard, solid part of the Earth’s crust.
  10. 17. The regular rise and fall of sea levels.