Across
- 4. Grass, clover, or alfalfa that has been cut, dried in the sun, and stored to be used as food for farm animals
- 5. To carefully watch using your senses
- 6. Tiny pieces of matter
- 11. A type of matter that contains metal
- 13. What an object is made of
- 14. Information collected from observations or tests
- 15. How sour or basic something is
- 16. To find the size, amount, or number of something
- 18. Specific rules, standards, or requirements used to judge, evaluate, or make a decision about something
- 19. To make a design work as well as possible
Down
- 1. A chemical sometimes used to get rid of germs in water
- 2. Not safe for living things
- 3. A sour tasting liquid made through a process called fermentation
- 7. Rules or limits that a design must follow
- 8. Everything around us that takes up space and has weight
- 9. Green, plant-like organisms that grow in water
- 10. A characteristic you can observe or measure
- 12. The system that cleans and makes water safe to drink
- 13. Two or more substances combined together
- 17. The process of separating solids from liquids using a screen or cloth