Across
- 4. move through a system and return to the starting point
- 5. a way of thinking or coming to mutual understanding
- 8. change into gas or steam
- 11. the downward slope of a hill
- 13. precipitation consisting of a mixture of rain and snow
- 14. an election to resolve a vote that did not produce a winner
- 15. submerge in a liquid
- 16. any of green pigments found in photosynthetic organisms
- 17. an oxide containing two atoms of oxygen in the molecule
- 18. a colorless, odorless gas that is essential for respiration
- 19. the emission of water vapor from the leaves of plants
Down
- 1. a tiny sphere of a liquid
- 2. the simplest structural unit of an element or compound
- 3. a specialized part of a cell; analogous to an organ
- 6. the totality of surrounding conditions
- 7. the falling to earth of any form of water
- 9. organelle in which photosynthesis takes place
- 10. a monosaccharide sugar that has several forms
- 12. an idea evoked by some experience
- 15. containing or filled with salt