Across
- 6. Evidence of past collisions on planetary surfaces
- 9. Extraterrestrial objects that reach Earth's surface
- 11. Outer layers of planets, including earth
Down
- 1. The most ancient minerals found on Earth
- 2. Rocks collected from the Moon's surface
- 3. Collection of celestial bodies, including the sun and planets
- 4. Process of how Earth came into existence
- 5. Determining the age of rocks or minerals using radioactive decay
- 7. Substances from Earth's distant past
- 8. The makeup or chemical structure of materials
- 10. The precise age of geological event or material