6th grade Chpt 1, Plate Tectonics
Across
- 4. one of Wegener’s evidence was that ____ of animals were found on different continents today
- 8. Wegener looked at maps and thought the continents could fit together like a jigsaw ____
- 12. when subduction occurs, it is because one plate is more ___ than the other
- 14. __ ___ ___ can form along a convergent boundary
- 15. a ___ boundary is where 2 plates move in opposite directions from each other with little up and down movement
- 17. this fault is a famous one running through California
- 20. the thin outer most layer of the earth- the layer on which we live
- 22. Hess showed from drilling samples that the further you get from mid-ocean ridges, the ___ the rock is
- 23. this part of the earth is solid nickel and iron
- 25. many did not believe Wegener because he couldn’t explain how the continents _____
- 26. he proposed the Theory of Plate Tectonics
- 28. another of Wegener’s evidence was that ___ tracks have been found in Africa and __ fossils in Antarctica
- 29. the crust is broken into pieces called ___ ___
- 30. the Theory of Plate Tectonics states that the plates are floating and moving along the ___
- 32. the upper part of the mantle
- 33. the process of one plate moving down under another because it is more dense
- 34. because this is so high, the molten material near the core heats and rises
- 35. this part of the earth is liquid nickel and iron
Down
- 1. how closely packed particles are in something
- 2. this scientist prosed the idea of sea floor spreading
- 3. this can form on land at a divergent boundary
- 5. Wegener’s supercontinent was called this
- 6. this scientist thought all the continents were once together
- 7. a ___ boundary is where 2 plates move apart
- 9. a ___ ___ is where 2 plates meet
- 10. in the ocean, at divergent boundaries, this land feature forms
- 11. Hess saw ___ ___ at mid-ocean ridge sites, they form when molten material cools quickly in water
- 13. any place where there is a crack in the crust
- 16. the lower part of the mantle
- 18. the layer in the Earth that has the most volume- composed of molten rock
- 19. Wegener thought all the continents moved apart in a process called __ __
- 21. this, in the mantle, is what is causing the plates to move
- 24. if the plate densities are similar along a convergent boundary, the ___ many form as they crush together
- 25. this evidence for seafloor spreading shows repeating patterns of earth’s magnetic signature in the rocks
- 27. a ___ boundary is where 2 plates come together
- 31. this technology uses sound waves to map the ocean floor