Across
- 3. hardest natural substance on Earth
- 4. the farthest planet from the sun
- 6. Phases the moon go through every 29.5 days
- 7. Part of the cell contains the genetic material
Down
- 1. Process by which plants make their own food using sunlight
- 2. The force that pulls objects toward the center of the Earth
- 5. How do living things change over time?