Across
- 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.
Down
- 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.