Across
- 3. our galaxy is known as the _______
- 7. is earths magnetic north pole slowing down or picking up speed?
- 9. degrees are divided into what smaller units
- 10. in 6 billion years, the sun will turn into _______
- 11. __________________is responsible for the formation of earths gravitational field
- 12. occured 15 billion years ago
- 14. how quickly the mood is moving away from earth
- 16. what lies at 90 degrees north latitude?
- 17. the release of volatile substances and water vapor from the earth is called ________
- 21. the planets solidified in a process known as _______
- 22. what type of object can give us information about the conditions in which the solid planets like earth formed?
- 23. ____ once had a magnetic field when the planets core cooled
Down
- 1. heavy rains fell for ______ years before the oceans were formed
- 2. experimenter from 1953
- 4. what brought water to earth?
- 5. ____ is ther explosion of a star
- 6. ________ of the clouds made heavy rains fall
- 8. _____ are tiny crystals formed from the beginning of earth
- 13. in 6 billion years the sun will burst and engulf other _________
- 15. The___is between 4.5 and 4.6 billion years old.
- 18. how many degrees are there in one hemisphere?
- 19. ____ sank towards earths center
- 20. ______ was most abundant in the universe after the big bang