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Across 1. When two oceanic plates collide, which one sinks? 4. What is the name of the supercontinent that formed 260 million years ago? 12. What do we use to measure plate movement? 16. Was Pangaea the only supercontinent? 17. What theory states that pieces of the lithosphere are in constant motion? 19. What is the name of this section? 20. What happens when an oceanic plate and a continental plate collide? 21. What do geologists think cause movement of the plates? 22. What is the maximum distance plates move in a year?

Down 2. What are the three types of plate boundaries? 3. What happens at a transform boundary? 4. What happens at a convergent boundary? 5. What do we call the area where plates meet? 6. What do we call a divergent boundary that occurs on land? 7. What happens at a divergent boundary? 8. Who developed the theory of plate tectonics? 9. What happens when two continental plates collide? 10. What explains a wide range of observations? 11. What is the name we use to describe what happens at a convergent boundary? 13. Where do divergent boundaries occur? 14. What happens when two continental plates collide? 15. What is the most important factor in determining what happens at a convergent boundary? 18. What do we call pieces of the lithosphere?