Across
- 4. The supercontinent Wegener theorised once existed
- 6. Magma that has erupted onto the surface
- 9. Underwater mountain range formed by diverging plates
- 10. Igneous rock that cools quickly above the surface
- 12. Plate boundary where plates collide
- 14. Type of current that causes the tectonic plates to move
- 17. Evidence for continental drift found on different continents
- 18. The spreading of this provides evidence for plate movement
- 19. Igneous rock that cools slowly beneath the surface
- 20. Process that breaks down rocks and moves sediments
- 21. Rock formed from cooled magma or lava
- 22. Process that presses sediments together
- 24. Scientist who proposed seafloor spreading
- 26. Earth's outermost solid layer
Down
- 1. Scientist who proposed continental drift
- 2. Process where one plate sinks beneath another
- 3. The thick layer of hot rock beneath the crust
- 5. Earth's innermost layer, made mostly of iron and nickel
- 7. Rock formed from layers of sediment
- 8. Deep areas in the ocean caused by subduction
- 11. Mountain that forms when magma reaches the surface
- 13. Rock changed by heat and pressure
- 15. Type of plates that move and cause earthquakes and volcanoes
- 16. Plate boundary where plates move apart
- 23. Plate boundary where plates slide past each other
- 25. Volcanic region fed by mantle plumes, not at a plate boundary