Name: Plate Tectonics Worksheet – PAGES 90-99 Use this word bank to match the vocabulary words with their definitions. Pangaea plate tectonics divergent boundary mantle convection mid-ocean ridge tectonic plate transform boundary ridge push sea-floor spreading convergent boundary subduction slab pull 1. A boundary where two plates move away from each other. 2. An oceanic plate moving under another plate at a convergent boundary. 3. A piece of the lithosphere. 4. The process in which hotter molten rock rises and cooler molten rock sinks. 5. A single large landmass that scientists believe broke up into the continents we have today. 6. A boundary where two plates collide. 7. The theory of how and why the continents move over time. 8. The process in which cooler crust sinks into the mantle, dragging the whole plate in that direction. 9. A boundary where two plates slide past each other and sometimes create earthquakes. 10. The process in which new crust at a mid-ocean ridge sinks and causes the plates on either side to move. 11. Huge underwater mountain range. 12. Theory that explains why the age of the crust by a midocean ridge follows a symmetrical (mirror) pattern. Name: Plate Tectonics Worksheet – PAGES 90-99 Here are some things that could happen at plate boundaries. Mark a red X if you would expect it to happen at a convergent boundary. Mark a blue circle if you would expect it to happen at a divergent boundary. Mark a green + if you would expect it to happen at a transform boundary. 13. earthquake 14. sea-floor spreading 15. ridge push 16. subduction 17. slab pull 18. NO new crust formed or old crust destroyed 19. mid-ocean ridge 20. mountains on land 21. Which crust is denser, continental or oceanic? 22. Which crust is denser, new crust or old crust? 23. Which crust is thicker, continental or oceanic? 24. If continental and oceanic crust collide, which crust sinks under the other one (subducts)? 25. Name one reason scientists started to think that the continents have moved.