1. Divergent boundary
2. Convergent boundary
3. Transform boundary
4. a. When two plates carrying oceanic crust collide, one plate is usually subducted beneath the other, forming a deep ocean trench and often causing volcanic activity and earthquakes. b. When two plates carrying continental crust collide, neither plate is easily subducted; instead, the crust crumples and thickens, forming large mountain ranges like the Himalayas. c. When a plate carrying oceanic crust collides with a plate carrying continental crust, the denser oceanic plate is subducted beneath the less dense continental plate, forming a trench, volcanic arcs, and mountain ranges on the continental side.
5. The movement of continents from one supercontinent to their present positions was caused by the force of mantle convection currents, which slowly drag and push the tectonic plates over millions of years.
6. theory
7. faults
8. tectonic plates
9. rift valley
10. plate tectonics
Parent Tip: Review the logic above to help your child master the concept of plate boundaries worksheet answers.
