Across
- 2. Small body of matter from outer space that enters the earth's atmosphere
- 5. Physicist who formulated the laws of motion and universal gravitation
- 6. Study of genes, heredity, and variation of organisms
- 7. Basic structural, functional and biological unit of all known living organisms
- 8. Substance with a pH less than 7
Down
- 1. Electrical potential difference between two points
- 3. Physicist known for the theory of relativity
- 4. Smallest unit of a chemical element