Caves & Caverns

1. A low passageway that can be crossed or accessed only by crawling.
3. A cave, or a chamber in a cave, typically a large one.
7. A narrow opening or fissure, especially in a rock or wall.
8. A transition area between the entrance and deeper parts of the cave under total darkness.
11. The action of forming or process of being formed.
14. An underground passage, especially one built through a hill or under a building, road, or river.
15. Staying alive by means of self care such as the consumption of food and/or water.
17. A piece of a solid substance (of the same material) having a natural geometrically regular form with symmetrically arranged plane faces, typically naturally occurring.
18. A very weak acid formed in solution when carbon dioxide dissolves in water.
19. The partial or total absence of light.

1. A colorless, odorless gas produced by burning carbon and organic compounds or by respiration.
2. A colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.
4. A hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.
5. A molecular rearrangement of a substance as opposed to a physical form change or nuclear reaction.
6. The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles.
9. A human being, especially a person as distinguished from an animal.
10. The naturally occurring thing that stimulates sight and makes things visible.
12. (Hands) Having or looking in an oily texture.
13. Solid inorganic substance that naturally occurs.
16. A type of mammal With their forelimbs adapted as wings.
18. A deep fissure in the earth, rock, or another surface.