Across
- 2. What theory explains the movement of the Earth's plates?
- 4. What is the primary rock type found in oceanic crust?
- 7. What term refers to how deep each layer of the Earth is?
- 11. What type of rock primarily makes up the continental crust?
- 13. What do we call the rigid layer made up of the upper mantle and the crust?
- 15. What process caused heavier elements to sink to the center of the Earth?
- 17. 25 miles is the approximate thickness of the continental___________ crust.
- 19. What layer of the Earth is liquid and composed of iron and nickel?
- 22. What formed about 4.5 billion years ago?
- 23. 3 to 5 miles is the approximate thickness of the __________ crust.
- 24. This layer is about 1,430 miles thick.
- 27. What term describes how tightly packed the atoms are in a substance?
- 28. What does the asthenosphere flow like?
- 29. What type of waves do we study to learn about Earth's layers?
- 31. What does the outer core help generate?
Down
- 1. What is the semi-rigid part of the middle mantle called?
- 3. What causes the movement in the mantle?
- 5. What is the solid innermost layer of the Earth?
- 6. What natural event helps us study the Earth's layers?
- 8. This layer is about 750 miles thick.
- 9. What state of matter is the inner core?
- 10. What is the largest layer of the Earth?
- 12. What term describes what materials make up each layer of the Earth?
- 14. What can we study to learn about Earth's early composition?
- 16. What characteristic increases as you go deeper into the Earth?
- 18. What is one important role of the Earth's crust?
- 20. What is a major component of both the crust and mantle?
- 21. What is the outermost layer of the Earth called?
- 25. What increases significantly as you go deeper into the Earth?
- 26. What element is found in high amounts in the crust?
- 30. What state of matter is the outer core?