Deep underground, sections of subducting plates can become locked in place. These pieces will move suddenly causing earthquakes. Which of these statements best explains why the plate becomes locked in place?

The angle of reflection is 30°

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)