natural things

2. A combustion process producing flame, heat, and light
3. A natural elevation of the Earth's surface, lower and gentler than a mountain
5. A large natural stream of water flowing towards the sea, a lake, or another river
6. A large expanse of saltwater covering most of the Earth's surface
8. The star at the center of our solar system that provides light and heat
9. The natural satellite of the Earth, visible at night as a bright, round object
13. A large body of water surrounded by land
14. Moving air, especially in a natural and continuous flow
15. A fixed luminous point in the night sky, mostly distant suns
17. A hard, solid substance from the Earth's crust, often used for building
18. Small loose grains of rock or mineral, found on beaches or in deserts

1. A low-growing green plant with narrow leaves, common in lawns and fields
4. Frozen water, solid and cold to the touch
5. Water falling from the clouds in drops
7. The colorful part of a plant that produces seeds
8. Frozen water crystals that fall from the sky as white flakes
10. A large natural elevation of the Earth's surface, higher and steeper than a hill
11. A large area covered mainly with trees and undergrowth
12. A mass of water droplets or ice crystals floating in the sky
16. A tall plant with a wooden trunk, branches, and leaves