Across
- 1. Smallest unit of matter that creates everything.
- 3. This method is how scientists test ideas about how the world works. They ask questions and carry out experiments.
- 5. The center of the earth.
- 6. The liquid that has a neutral pH level. Main component of blood. Should drink about 12-15 cups a day.
- 8. The force by which all things with mass or energy are brought toward one another.
- 9. Main organ of the respiratory system
- 10. Main organ of the cardiovascular system.
- 13. Center of an atom and center of a cell.
- 15. System that contains the brain, spinal cord and brainstem.
Down
- 2. The amount of material contained in a particular object.
- 4. Type of energy sources that CANNOT be replenished.
- 5. The outermost layer of the earth.
- 7. The green substance found in plants.
- 11. A virus causing the current global pandemic.
- 12. The star that Earth orbits around.
- 14. Smallest unit of life.