Across
- 5. scientific method of dating trees
- 7. a period that began 2.6 million years ago and extends until today
- 8. where the magnetic field is 2,500 times stronger than the earths
- 9. the smallest and weakest cell
- 11. the effect where the earth is heated up long-term
- 12. a cylinder of ice that has been drilled of an ice sheet or glacier
Down
- 1. the shape of the worlds orbit
- 2. caused where the ocean is warm and water vapour rises
- 3. change in the orientation of a rotating body
- 4. rises and falls irregularly
- 6. where trade winds are blown towards the equator
- 10. moves opposite to the other two cells