Across
- 3. a underwater geographic feature formed by subduction
- 6. The lithosphere floats on this semi liquid layer in the upper mantle
- 11. crust with high elevation and made from granite
- 12. floats on top of the lithosphere and moved by convection currents
- 13. the layers of the earth defined by there chemical makeup
- 15. when the magnetic field switches poles
- 17. she graft the surface of the ocean and created the theory of sea floor spreading
- 18. helps us understand the composition of earth
- 19. found at underwater divergent boundary's when molten lava cools very fast
- 21. when a oceanic plate collides into a continental
- 23. movement on the sea floor that is caused by a divergent boundary
- 24. he created the theory of tectonic drift
- 25. an earth shaking event made by two plates interacting
Down
- 1. Crust that mostly consist of basalt
- 2. the layer under the crust
- 4. powers the movement of tectonic plates
- 5. earth continental formation 250 million years ago
- 7. magnetic mineral use to track the moments where the magnetic fields swapped
- 8. protects the earth from deadly radiations
- 9. the main material found in continental crust
- 10. the seafloor is made of this mineral
- 14. a plate boundary where the 3 plates slide horizontally
- 16. a geological feature formed at a underwater divergent boundary
- 20. the earth's outermost and thinnest layer
- 22. the only molten layer of earth