Across
- 5. Last name of the scientist couple who discovered radium.
- 6. Large, humpbacked mammal of North America.
- 9. Physicist known for the theory of relativity.
Down
- 1. Hard, white material from tusks.
- 2. Former planet now classified as a dwarf planet.
- 3. Arizona city known for its red sandstone formations.
- 4. African mammal known for its distinctive stripes.
- 7. Sweet liquid produced by flowers.
- 8. Planet named after the Roman goddess of love.
- 10. Fish known for swimming upstream to spawn.