Across
- 2. Earth is _______ billion years old.
- 6. The most inner part of Earth.( put - between two words only in this section)
- 7. To use some thing again.
- 8. The month of Earth day.
Down
- 1. The circumference of Earth is ____ miles.(Don't forget to write the comma separately)
- 3. Some thing present in the air without which we cannot survive.
- 4. Another name for water.
- 5. _______ glaciers have an impact on Earth's shape.